diff --git a/DownloadDCFirmware/DownloadDCFirmware.pro b/DownloadDCFirmware/DownloadDCFirmware.pro
index 088f6d1..51f5641 100644
--- a/DownloadDCFirmware/DownloadDCFirmware.pro
+++ b/DownloadDCFirmware/DownloadDCFirmware.pro
@@ -1,7 +1,6 @@
-QT += core gui
-QT += widgets serialport network
+QT += core serialport
 
-TARGET = ATBDownloadDCFirmware
+TARGET = ATBUpdateDC
 
 VERSION="0.1.0"
 win32 {
@@ -77,21 +76,21 @@ contains( CONFIG, DesktopLinux ) {
 
 SOURCES += \
         main.cpp \
-        mainwindow.cpp \
         ../common/src/message_handler.cpp \
         ../UpdatePTUDevCtrl/commandline_parser.cpp \
         update.cpp \
-        dc_download.cpp \
-        ../common/src/System.cpp
+        ../common/src/System.cpp \
+        ../common/src/utils_internal.cpp \
+        ../common/src/command.cpp
 
 
 HEADERS += \
-        mainwindow.h \
         ../common/include/message_handler.h \
         ../UpdatePTUDevCtrl/commandline_parser.h \
         update.h \
-        dc_download.h \
-        ../common/include/System.h
+        ../common/include/System.h \
+        ../common/include/utils_internal.h \
+        ../common/include/command.h
 
 
 OTHER_FILES += \
diff --git a/DownloadDCFirmware/main.cpp b/DownloadDCFirmware/main.cpp
index 7c39038..793db15 100644
--- a/DownloadDCFirmware/main.cpp
+++ b/DownloadDCFirmware/main.cpp
@@ -1,7 +1,6 @@
 
 #include <QtGlobal>
 #include <QCoreApplication>
-#include <QApplication>
 #include <QByteArray>
 
 #include <QProcess>
@@ -11,12 +10,13 @@
 #include <QDir>
 #include <QDebug>
 #include <QThread>
+#include <QRegularExpression>
 
 #include "message_handler.h"
 #include "commandline_parser.h"
 #include "utils.h"
+#include "utils_internal.h"
 #include "update.h"
-#include "mainwindow.h"
 #include "System.h"
 
 #include <DeviceController/interfaces.h>
@@ -52,17 +52,22 @@ int main(int argc, char **argv) {
     }
     // qputenv("XDG_RUNTIME_DIR", "/var/run/user/0");
 
-    openlog("ATB-UPDATE-DC-FIRMWARE", LOG_PERROR | LOG_PID | LOG_CONS, LOG_USER);
+    openlog("DC", LOG_PERROR | LOG_CONS, LOG_USER);
+
+    QCoreApplication a(argc, argv);
+    QCoreApplication::setOrganizationName("ATB Automatentechnik Baumann GmBH");
+    QCoreApplication::setApplicationName("ATBUpdateDC");
+    QCoreApplication::setApplicationVersion(APP_VERSION);
 
-    QApplication a(argc, argv);
-    QApplication::setApplicationName("ATBDownloadDCFirmware");
-    QApplication::setApplicationVersion(APP_VERSION);
 
     if (!messageHandlerInstalled()) { // change internal qt-QDebug-handling
         atbInstallMessageHandler(atbDebugOutput);
         setDebugLevel(LOG_NOTICE);
     }
 
+    //return 0;
+
+/*
     CommandLineParser parser;
     parser.process(a);
     parser.readSettings();
@@ -73,6 +78,7 @@ int main(int argc, char **argv) {
     QString workingDir = parser.workingDir();
     QString psaConfigDir = parser.psaConfigDir();
     QString psaTariffDir = parser.psaTariffDir();
+    QString psaDcDir = parser.dcDir();
     QString iniFileName = parser.iniFileName();
     bool const dryRun = parser.dryRun();
     bool const noUpdatePsaHardware = parser.noUpdatePsaHardware();
@@ -81,6 +87,7 @@ int main(int argc, char **argv) {
     bool const showExtendedVersion = parser.extendedVersion();
     bool const alwaysDownloadConfig = parser.alwaysDownloadConfig();
     bool const alwaysDownloadDC = parser.alwaysDownloadDC();
+    bool const readDCVersion = parser.readDCVersion();
 
     QString const rtPath = QCoreApplication::applicationDirPath();
 
@@ -109,27 +116,87 @@ int main(int argc, char **argv) {
     qInfo() << "machineNr ................" << machineNr;
     qInfo() << "customerNr ..............." << customerNr;
     qInfo() << "zoneNr ..................." << zoneNr;
+    qInfo() << "readDCVersion ............" << readDCVersion;
+    qInfo() << "dcDir ...................." << psaDcDir;
+
+    if (!QDir(plugInDir).exists()) {
+        qCritical() << plugInDir
+                    << "does not exists, but has to contain dc-library";
+        exit(-1);
+    }
 
     if (showExtendedVersion) {
         printf(APP_EXTENDED_VERSION"\n");
         return 0;
     }
 
-    QString const &customerRepo = QDir::cleanPath(workingDir + QDir::separator() + QString("customer_%1").arg(customerNr));
-    QStringList filesToUpdate;
+    QString const &customerRepo
+        = QDir::cleanPath(workingDir + QDir::separator() + QString("customer_%1").arg(customerNr));
+*/
 
-    QThread::currentThread()->setObjectName("main thread");
-    qInfo() << "Main thread" << QThread::currentThreadId();
+    QString const &psaDcDir = internal::customerRepoDcDir();
+    QString const &psaRepoRootDir = internal::customerRepoRoot();
+    QString const &psaRepoDir = internal::customerRepoDir();
+    QString const &branchName = internal::branchName();
 
-    MainWindow mw;
+    bool debug = false;
+    bool noaction = true;
+    QString workingDir;
+    QString libDir;
+    QString libca;
 
-    mw.setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
-    // mw.showFullScreen();
+    std::unique_ptr<QSettings> settings = internal::readSettings();
 
-    // qCritical() << "SHOW";
+    if (settings) {
+        settings->beginGroup("DIRECTORIES");
+        workingDir = settings->value("workingdir", "/tmp").toString();
+        libDir = settings->value("plugin-directory", "/usr/lib/").toString();
+        settings->endGroup();
 
-    // mw.show();
+        settings->beginGroup("FLAGS");
+        debug = settings->value("debug", false).toBool();
+        settings->endGroup();
+
+        settings->beginGroup("PLUGINS");
+        libca  = libDir + settings->value("plugin-name", "libCAslave.so").toString();
+        settings->endGroup();
+    }
+
+    // etc/dc: located under mount-path
+    std::optional<QString> mountPath = System::checkForUSBStick(psaDcDir);
+    QFileInfo fi;
+    if (mountPath.has_value()) {
+        fi.setFile(mountPath.value(), System::getDCFileOnUsbStick(mountPath.value()));
+    } else
+    if ((mountPath = System::checkForSDCard(psaDcDir)).has_value()) {
+        fi.setFile(mountPath.value(), System::getDCFileOnSDCard(mountPath.value()));
+    } else {
+
+        if (debug) {
+            qInfo() << "using customer repository" << psaRepoDir;
+        }
+
+        std::unique_ptr<QString> c = internal::dcCandidateToInstall("/etc/dc/");
+        if (c) {
+            fi.setFile(*c);
+            if (fi.exists() == false) {
+                qCritical() << "dc2c.bin candidate" << *c << "does not exist. STOP.";
+                return -1;
+            }
+            qInfo() << "dc2c.bin canditate" << fi.absoluteFilePath();
+        }
+    }
+
+    if (debug) {
+        qInfo() << "downloading dc-firmware" << fi.absoluteFilePath();
+        qInfo() << "dc-firmware size (bytes)" << fi.size();
+        qInfo() << "dc-version" << Update::dcVersion(fi.absoluteFilePath());
+    }
+
+    Update u(fi.absoluteFilePath(), libca, debug, noaction);
+    u.run();
+
+    qInfo() << "<DC-UPDATE-FINISH>";
 
     return 0;
-    // return a.exec();
 }
diff --git a/DownloadDCFirmware/mainwindow.h b/DownloadDCFirmware/mainwindow.h
index 72a2ea1..7a76079 100644
--- a/DownloadDCFirmware/mainwindow.h
+++ b/DownloadDCFirmware/mainwindow.h
@@ -1,10 +1,7 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
-#include <QMainWindow>
 #include <QTimer>
-#include <QStatusBar>
-#include <QWidget>
 #include <QSerialPort>
 #include <QSerialPortInfo>
 
diff --git a/DownloadDCFirmware/update.cpp b/DownloadDCFirmware/update.cpp
index c42103f..7627e31 100644
--- a/DownloadDCFirmware/update.cpp
+++ b/DownloadDCFirmware/update.cpp
@@ -1,4 +1,5 @@
 #include "update.h"
+#include "command.h"
 
 #include <QCoreApplication>
 #include <QFile>
@@ -21,10 +22,16 @@
 #include <QDateTime>
 #include <QPluginLoader>
 #include <QMap>
+#include <QStringList>
+#include <QString>
+#include <QSerialPort>
+#include <QSerialPortInfo>
+#include <QSettings>
 
 #define UPDATE_OPKG                 (1)
 #define UPDATE_DC                   (0)
 
+
 static const QMap<QString, int> baudrateMap = {
   {"1200"   ,   0}, {"9600"   ,   1}, {"19200"  ,   2}, {"38400"  ,   3},
   {"57600"  ,   4}, {"115200" ,   5}
@@ -32,48 +39,38 @@ static const QMap<QString, int> baudrateMap = {
 
 QPluginLoader Update::pluginLoader;
 
-hwinf *Update::loadDCPlugin(QDir const &plugInDir, QString const &fname) {
+hwinf *Update::loadDCPlugin(QString const &libCA /* absolute file path */) {
     hwinf *hw = nullptr;
-    if (plugInDir.exists()) {
-        QString pluginLibName(fname);
-        pluginLibName = plugInDir.absoluteFilePath(pluginLibName);
-        QFileInfo info(pluginLibName);
-        if (info.exists()) {
-            pluginLibName = plugInDir.absoluteFilePath(pluginLibName);
-            pluginLoader.setFileName(pluginLibName);
-            // static QPluginLoader pluginLoader(pluginLibName);
-            if (!pluginLoader.load()) {
-                qCritical() << "in directory" << plugInDir.absolutePath();
-                qCritical() << "cannot load plugin" << pluginLoader.fileName();
-                qCritical() << pluginLoader.errorString();
-                return nullptr;
-            }
+    QFileInfo libCAInfo(libCA);
+    if (libCAInfo.exists()) {
+        pluginLoader.setFileName(libCA);
+        // static QPluginLoader pluginLoader(pluginLibName);
+        if (!pluginLoader.load()) {
+            qCritical() << "cannot load plugin" << pluginLoader.fileName();
+            qCritical() << pluginLoader.errorString();
+            return nullptr;
+        }
 
-            qCritical() << "loadDCPlugin() plugin directory:" << plugInDir.absolutePath();
-            qCritical() << "loadDCPlugin() plugin file name:" << pluginLoader.fileName();
+        // qCritical() << "loadDCPlugin() plugin file name:" << pluginLoader.fileName();
 
-            if (!pluginLoader.isLoaded()) {
-                qCritical() << pluginLoader.errorString();
-                return nullptr;
-            }
-            QObject *plugin = pluginLoader.instance();
-            if (!plugin) {
-                qCritical() << "cannot start instance";
-                return nullptr;
-            }
-            if (! (hw = qobject_cast<hwinf *>(plugin))) {
-                qCritical() << "cannot cast plugin" << plugin << "to hwinf";
-                return nullptr;
-            }
-        } else {
-            qCritical() << pluginLibName << "does not exist";
+        if (!pluginLoader.isLoaded()) {
+            qCritical() << pluginLoader.errorString();
+            return nullptr;
+        }
+        QObject *plugin = pluginLoader.instance();
+        if (!plugin) {
+            qCritical() << "cannot start instance";
+            return nullptr;
+        }
+        if (! (hw = qobject_cast<hwinf *>(plugin))) {
+            qCritical() << "cannot cast plugin" << plugin << "to hwinf";
             return nullptr;
         }
     } else {
-        qCritical() << "plugins directory" << plugInDir.absolutePath()
-                    << "does not exist";
+        qCritical() << libCAInfo.absoluteFilePath() << "does not exist";
         return nullptr;
     }
+
     return hw;
 }
 
@@ -92,347 +89,389 @@ bool Update::unloadDCPlugin() {
     return false;
 }
 
+QString Update::dcVersion(QString const &dcBinFile) {
+    QProcess p;
+    QStringList params;
+
+    params << "-c" << QString(R"(strings %1 | grep DC2c.\[0-9\] | uniq)").arg(dcBinFile);
+
+    p.start("bash", params);
+    p.waitForFinished();
+    return QString(p.readAllStandardOutput()).trimmed().split(QRegularExpression("\\s")).first();
+}
+
 class hwapi;
-Update::Update(QString customerRepository,
-               QString customerNrStr,
-               QString branchName,
-               QString plugInDir,
-               QString pluginName,
-               QString workingDir,
-               bool dryRun,
-               QObject *parent,
-               char const *serialInterface,
-               char const *baudrate)
-    : QObject(parent)
-    , m_hw(loadDCPlugin(QDir(plugInDir), pluginName))
-    , m_serialInterface(serialInterface)
-    , m_baudrate(baudrate)
-    , m_customerRepository(customerRepository)
-    , m_customerNrStr(customerNrStr)
-    , m_branchName(branchName)
-    , m_pluginName(pluginName)
-    , m_workingDir(workingDir)
-    , m_dryRun(dryRun)
-    , m_sys_areDCdataValid(false) {
-
-    if (!m_hw) {
-        qCritical() << "(" << __func__ << ":" << __LINE__ << ") m_hw == nullptr -> ca-slave plugin loaded ???";
-    } else {
-        int tries = 20;
-        while ((m_sys_areDCdataValid = m_hw->sys_areDCdataValid()) == false) {
-            // must deliver 'true', only then are all data from hwapi valid
-            if (--tries < 0) {
-                qCritical() << "ERROR!!! DC DATA NOT VALID -> CA-MASTER-PLUGIN NOT CONNECTED";
-                break;
-            }
-            m_hw->dc_autoRequest(true);
-            QThread::msleep(500);
-        }
-
-        qCritical() << "(" << __func__ << ":" << __LINE__ << ") m_sys_areDCDataValid ..."
-                    << m_sys_areDCdataValid;
-    }
+Update::Update(QString const &dcFileName, QString const &libCA, bool debug, bool noaction)
+    : m_dcFileName(dcFileName)
+    , m_hw(loadDCPlugin(libCA))
+    , m_sys_areDCdataValid(false)
+    , m_debug(debug)
+    , m_noaction(noaction) {
 }
 
 Update::~Update() {
     unloadDCPlugin();
 }
 
-bool Update::doUpdate(QStringList const &filesToWorkOn, bool usbStickDetected) {
-
-    if (!m_hw) {
-        qCritical() << "(" << __func__ << ":" << __LINE__ << "):"
-                    << "ERROR!!! m_hw == nullptr";
-        return false;
+Update::DownloadResult Update::sendStatus(int ret) const {
+    switch (ret) {                  // return values of dc are:
+    case 0:                         // 0: no answer by now
+        return DownloadResult::NOP; // 1: error
+    case 10:                        // 10: success
+        return DownloadResult::OK;
+    default:;
     }
-
-    int tries = 20;
-    while ((m_sys_areDCdataValid = m_hw->sys_areDCdataValid()) == false) {
-        // must deliver 'true', only then are all data from hwapi valid
-        if (--tries < 0) {
-            qCritical() << "(" << __func__ << ":" << __LINE__ << "):"
-                        << "ERROR!!! DC DATA NOT VALID -> CA-SLAVE-PLUGIN NOT CONNECTED";
-            return false;
-        }
-        qCritical() << "(" << __func__ << ":" << __LINE__ << "):"
-                    << "ERROR!!! DC DATA NOT VALID -> CA-SLAVE-PLUGIN NOT CONNECTED (" << tries << ")";
-        m_hw->dc_autoRequest(true);
-        QThread::msleep(500);
-    }
-
-    bool res = false;
-
-    QList<QString>::const_iterator it;
-    for (it = filesToWorkOn.cbegin(); it != filesToWorkOn.cend(); ++it) {
-        QString const &fToWorkOn = usbStickDetected ? QDir::cleanPath(it->trimmed())
-            : QDir::cleanPath(m_customerRepository + QDir::separator() + it->trimmed());
-        if (fToWorkOn.contains("DC2C_print", Qt::CaseInsensitive)
-         && fToWorkOn.endsWith(".json", Qt::CaseInsensitive)) {
-            res = true;
-            int i = fToWorkOn.indexOf("DC2C_print", Qt::CaseInsensitive);
-            int const templateIdx = fToWorkOn.mid(i).midRef(10, 2).toInt();
-            if ((templateIdx < 1) || (templateIdx > 32)) {
-                qCritical() << "WRONG TEMPLATE INDEX" << templateIdx;
-                res = false;
-            } else {
-                if ((res = updatePrinterTemplate(templateIdx, fToWorkOn))) {
-                    qCritical() <<
-                        QString("DOWNLOADED PRINTER TEMPLATE %1 WITH INDEX=%2")
-                            .arg(fToWorkOn)
-                            .arg(templateIdx);
-                }
-            }
-        } else if (fToWorkOn.contains("DC2C_cash", Qt::CaseInsensitive)
-                && fToWorkOn.endsWith(".json", Qt::CaseInsensitive)) {
-            if ((res = updateCashConf(fToWorkOn))) {
-                qCritical() << QString("DOWNLOADED CASH TEMPLATE %1").arg(fToWorkOn);
-            }
-        } else if (fToWorkOn.contains("DC2C_conf", Qt::CaseInsensitive)
-                && fToWorkOn.endsWith(".json", Qt::CaseInsensitive)) {
-            if ((res = updateConfig(fToWorkOn))) {
-                qCritical() << QString("DOWNLOADED CONFIG TEMPLATE %1").arg(fToWorkOn);
-            }
-        } else if (fToWorkOn.contains("DC2C_device", Qt::CaseInsensitive)
-                && fToWorkOn.endsWith(".json", Qt::CaseInsensitive)) {
-            if ((res = updateDeviceConf(fToWorkOn))) {
-                qCritical() << QString("DOWNLOADED DEVICE TEMPLATE %1").arg(fToWorkOn);
-            }
-        } else {
-            qCritical() << "UNKNOWN JSON FILE NAME" << fToWorkOn;
-            res = false;
-        }
-    }
-
-    return res;
+    return DownloadResult::ERROR;
 }
 
-bool Update::checkJsonVersions(QStringList const& jsonFileNames) {
-    if (!m_hw) {
-        qCritical() << "(" << __func__ << ":" << __LINE__ << "):"
-                    << "ERROR!!! m_hw == nullptr";
-        return false;
-    }
+Update::DownloadResult
+Update::sendNextAddress(int bNum) const {
+    // sends address only if blockNumber is one of 0, 1024, 2048, 3072, 4096
+    int noAnswerCount = 0;
+    int errorCount = 0;
+    if ( bNum==0 || bNum==1024 || bNum==2048 || bNum==3072 || bNum==4096 ) {
+        // qDebug() << "addr-block" << bNum << "...";
+        while (noAnswerCount <= 250) {
 
-    int tries = 20;
-    while ((m_sys_areDCdataValid = m_hw->sys_areDCdataValid()) == false) {
-        // must deliver 'true', only then are all data from hwapi valid
-        if (--tries < 0) {
-            qCritical() << "(" << __func__ << ":" << __LINE__ << "):"
-                        << "ERROR!!! DC DATA NOT VALID -> CA-SLAVE-PLUGIN NOT CONNECTED";
-            return false;
+            DownloadResult res = DownloadResult::OK;
+            if (!m_debug) {
+                m_hw->bl_sendAddress(bNum);
+
+                QThread::msleep(10); //from 100ms to 20ms
+//###################################################################################
+                res = sendStatus(m_hw->bl_wasSendingAddOK());
+            }
+
+            if (res != DownloadResult::NOP) {
+                if (res == DownloadResult::ERROR) {
+                    if (++errorCount >= 10) {
+                        qCritical() << "addr-block" << bNum << "...FAILED";
+                        return res;
+                    }
+                } else { // res == DownloadResult::OK
+                    qInfo() << nextTimePoint().toUtf8().constData() << "addr-block" << bNum << "...done";
+                    return res;
+                }
+            } else {
+                noAnswerCount += 1; // no answer by now
+            }
+        } // while
+        // wait max. about 3 seconds
+        return DownloadResult::TIMEOUT;
+    }
+    // blockNumber is not one of 0, 1024, 2048, 3072, 4096 -> do nothing
+    return DownloadResult::NOP;
+}
+
+Update::DownloadResult
+Update::sendNextDataBlock(QByteArray const &binary, int bNum) const {
+    uint8_t local[66];
+    int const bAddr = bNum * 64;
+    int noAnswerCount = 0;
+    int errorCount = 0;
+
+    memcpy(local, binary.constData() + bAddr, 64);
+    local[64] = local[65] = 0x00;
+
+    QString s = nextTimePoint();
+    s += " sending block ";
+    s += QString("%1/%2 ...done <DC-PROGRESS>").arg(bNum).arg(m_totalBlocks);
+    s += QString::number(ceil(((bNum * 100.0) / (double)m_totalBlocks)));
+
+    qInfo() << s.toUtf8().constData();
+
+    QThread::msleep(20); //reduce from 200 to 50 ms
+    //############################################################################
+
+    QByteArray b((const char *)(&local[0]), 64);
+    qCritical() << "SNDB" << bNum << b.size() << b.toHex();
+
+    while (noAnswerCount <= 250) {
+
+        DownloadResult res = DownloadResult::OK;
+
+        if (!m_debug) {
+            m_hw->bl_sendDataBlock(64, local);
+            res = sendStatus(m_hw->bl_wasSendingDataOK());
         }
-        qCritical() << "(" << __func__ << ":" << __LINE__ << "):"
-                    << "ERROR!!! DC DATA NOT VALID -> CA-SLAVE-PLUGIN NOT CONNECTED (" << tries << ")";
-        m_hw->dc_autoRequest(true);
-        QThread::msleep(500);
+
+        if (res != DownloadResult::NOP) {
+            if (res == DownloadResult::ERROR) {
+                if (++errorCount >= 10) {
+                    qCritical() << "data for block" << bNum << "...FAILED";
+                    return res;
+                }
+            } else {
+                qInfo() << nextTimePoint().toUtf8().constData() << "data for block"
+                        << QString("%1/%2").arg(bNum).arg(m_totalBlocks) << "done";
+                return res;
+            }
+        } else {
+            noAnswerCount += 1; // no answer by now
+        }
+    }
+    // wait max. about 3 seconds
+    return DownloadResult::TIMEOUT;
+}
+
+bool Update::startBootloader() const {
+    qDebug() << "starting bootloader...";
+
+    if (!m_debug) {
+        int nTry = 10;
+        while (--nTry >= 0) {
+            m_hw->bl_startBL();
+            QThread::msleep(1000);
+            m_hw->bl_checkBL();
+            if (m_hw->bl_isUp()) {
+                qInfo() << "starting bootloader...OK";
+                QThread::msleep(5000);
+                return true;
+            } else {
+                qCritical() << "bootloader not up (" << nTry << ")";
+                qCritical() << "IS BOOTLOADER INSTALLED ???";
+            }
+        }
+        qCritical() << "starting bootloader...FAILED";
+        return false;
+    } else {
+        QThread::msleep(1000);
+        qInfo() << "starting bootloader...OK";
     }
 
-    for (QStringList::size_type i=0; i < jsonFileNames.size(); ++i) {
+    return true;
+}
 
-        uint8_t jsonNr = 0;
+bool Update::stopBootloader() const {
+    qDebug() << "stopping bootloader...";
 
-        QString const &fName = jsonFileNames[i];
+    if (!m_debug) {
+        int nTry = 5;
+        while (--nTry >= 0) {
+            m_hw->bl_stopBL();
+            QThread::msleep(1000);
+            if (!m_hw->bl_isUp()) {
+                qInfo() << "stopping bootloader...OK";
+                return true;
+            }
+        }
+        qCritical() << "stopping bootloader...FAILED";
+        return false;
 
-        // send one request for every single version
-        // jsonNr=1...36, 1=config file (cust.Nr) 2=devices  3=cash  4=res.
-        //      6=printer template 1 ..... 36= template 32
+    } else {
+        QThread::msleep(1000);
+        qInfo() << "stopping bootloader...OK";
+    }
 
-        if (fName.endsWith("conf.json")) {
-            jsonNr = 1;
-        } else
-        if (fName.endsWith("device.json")) {
-            jsonNr = 2;
-        } else
-        if (fName.endsWith("cash.json")) {
-            jsonNr = 3;
-        } else {
-            QRegularExpressionMatch match;
-            static const QRegularExpression re("^(.*print)([0-3][0-9])\\.json\\s*$");
-            int idx = fName.indexOf(re, 0, &match);
-            if (idx != -1) {
-                QString captured = match.captured(match.lastCapturedIndex());
-                bool ok = false;
-                int n = captured.toInt(&ok);
-                if (ok) {
-                    // note: use 5 (instead of 4 -> index has been shifted)
-                    jsonNr = n + 5;
+    return true;
+}
+
+bool Update::resetDeviceController() const {
+    qInfo() << nextTimePoint().toUtf8().constData() << "resetting device controller";
+
+    if (!m_debug) {
+        m_hw->bl_rebootDC();
+    }
+
+    // wait maximally 3 seconds, before starting bootloader
+    QThread::sleep(1);
+
+    qInfo() << nextTimePoint().toUtf8().constData()
+            << "resetting device controller ...done";
+
+    return true;
+}
+
+
+QByteArray Update::loadBinaryDCFile(QString const &filename) const {
+
+    QFile file(filename); // closed in destructor call
+    if (!file.exists()) {
+        qCritical() << "(" << __func__ << ":" << __LINE__ << ")"
+                    << file.fileName() << "does not exist";
+        return QByteArray{};
+    }
+    if (!file.open(QIODevice::ReadOnly)) {
+        qCritical() << "(" << __func__ << ":" << __LINE__ << ")"
+                    << "cannot open file" << file.fileName();
+        return QByteArray{};
+    }
+
+    qInfo() << nextTimePoint().toUtf8().constData()
+            << "loading dc binary to memory" << Update::dcVersion(filename) << "...done";
+
+    return file.readAll();
+}
+/*
+ ///////////////////////////////////////////////////////////////////////////////
+ //
+ //                        USING THE DC BOOTLOADER
+ //
+ ///////////////////////////////////////////////////////////////////////////////
+
+ 1  :   bl_reboot()     // send to application, want DC2 to reset (in order to
+                        // start the bootloader)
+                        //
+                        // NOTE: this function is NOT reliable !!! Sometimes it
+                        // simply does not work, in which case bl_startBL,
+                        // bl_checkBL and bl_isUp do not work as well.
+                        // Alas, there is no feedback if bl_reboot worked!
+                        //
+                        // NOTE: this function can be called only once per
+                        // minute, because once called again, the controller
+                        // performs some self-checks consuming some time.
+                        //
+                        // NOTE: after a successful bl_reboot(), the device is
+                        // waiting about 4 seconds in the bootloader. To stay in
+                        // the bootloader, we have to send the command
+                        // bl_startBL(), which is kind of a misnomer, as it
+                        // should be bl_doNotLeaveBL().
+                        //
+ 2  :   bl_startBL():   // send within 4s after DC power-on, otherwise
+                        // bootloader is left.
+                        //
+                        // NOTE: a running bootloader is a MUST for the download
+                        // process of a device controller firmware as it does
+                        // the actual writing of the memory (the bl_reboot()
+                        // from above erases the available memory).
+                        //
+ 3  :   bl_check():     // send command to verify if bl is up
+                        //
+                        // NOTE: this command is kind of a request that we want
+                        // to check if the bootloader is up. The device
+                        // (actually the bootloader) responds with its version.
+                        //
+ 4  :   bl_isUp():      // returns true if bl is up and running
+                        //
+                        // NOTE: we know what the bootloader version actually is
+                        // as the bootloader does not change. By comparing the
+                        // string received in the previous step with this known
+                        // version string we know if the bootloader is up.
+                        //
+                        // NOTE FOR ALL PREVIOUS STEPS: execute them in their
+                        // own slots each to be sure to receive any possible
+                        // responds from the device.
+                        //
+ 5  :   bl_sendAddress(blockNumber)
+                        // send start address, nr of 64-byte block, start with 0
+                        // will be sent only for following block-numbers:
+                        // 0, 1024, 2048, 3072 and 4096, so basically every
+                        // 64kByte.
+                        // for other addresses nothing happens
+
+ 6  :   bl_wasSendingAddOK()
+                        // return val:  0: no response by now
+                        //              1: error
+                        //             10: OK
+
+ 7  :   bl_sendDataBlock()
+                        // send 64 byte from bin file
+
+ 8  :   bl_sendLastBlock()
+                        // send this command after all data are transferred
+
+ 9  :   bl_wasSendingDataOK()
+                        // return val:  0: no response by now
+                        //              1: error
+                        //             10: OK
+
+ 10 :   bl_stopBL()     // leave bl and start (the new) application
+                        //
+                        // NOTE: this function MUST work under all conditions.
+                        // Alas, there is no direct result for this command, so
+                        // the only way of knowing it was successful is to ask
+                        // the device if the bootloader is still running.
+                        // There is no problem to repeat this command until the
+                        // bootloader is really not running anymore.
+ */
+int Update::run() {
+    if (!m_hw) {
+        qCritical() << "(" << __func__ << ":" << __LINE__ << ") m_hw == nullptr -> ca-slave plugin loaded ???";
+        return -(int)Result::PLUGIN_LOAD_ERROR;
+    }
+
+    m_start = QDateTime::currentDateTime();
+
+    if (m_debug) {
+        qInfo() << "start dc-update for" << m_dcFileName << "at" << m_start.toString(Qt::ISODate);
+        qInfo() << "<DC-VERSION>" << Update::dcVersion(m_dcFileName);
+    }
+
+    if (!m_debug) {
+        m_hw->dc_autoRequest(false);
+    }
+
+    qInfo() << "DC auto request OFF";
+
+    qCritical() << "start dc-update for" << m_dcFileName << "at" << m_start.toString(Qt::ISODate);
+
+    QByteArray ba = loadBinaryDCFile(m_dcFileName);
+    if (ba.size() > 0) {
+        m_totalBlocks = (((ba.size())%64)==0) ? (ba.size()/64) : (ba.size()/64)+1;
+
+        qInfo() << nextTimePoint().toUtf8().constData() << "blocks to send" << m_totalBlocks;
+
+        // fill last block of data to be sent with 0xFF
+        ba = ba.leftJustified(m_totalBlocks*64, (char)(0xFF));
+
+        resetDeviceController();
+        if (startBootloader()) {
+
+            int currentBlock = 0;
+            DownloadResult res = DownloadResult::OK;
+            qInfo() << nextTimePoint().toUtf8().constData() << "64-byte block" << currentBlock;
+
+            while (res != DownloadResult::ERROR && currentBlock <= m_totalBlocks) {
+                if ((res = sendNextAddress(currentBlock)) != DownloadResult::ERROR) {
+                    if ((res = sendNextDataBlock(ba, currentBlock)) != DownloadResult::ERROR) {
+                        currentBlock += 1;
+                    } else break;
                 }
             }
+
+#if 0
+            qCritical() << "DownloadThread::run(): last 64-byte block %04d" << currentBlock;
+
+            int const rest = ba.size() % 64;
+            int const offset = ba.size() - rest;
+            char const *startAddress = ba.constData() + offset;
+
+            if (rest > 0) {
+                // SHOULD NEVER HAPPEN !!!
+                uint8_t local[66];
+                memset(local, 0xFF, sizeof(local));
+                memcpy(local, startAddress, rest);
+                qCritical() << "DownloadThread::run(): ERROR SEND REMAINING" << rest << "BYTES";
+                m_hw->bl_sendDataBlock(64, local);
+            } else {
+                m_hw->bl_sendLastBlock();
+                m_hw->dcDownloadSetCurrentBlockNumber(currentBlock);
+            }
+            qCritical() << "DownloadThread::run(): last result" << (int)sendStatus(m_hw->bl_wasSendingDataOK());
+#endif
+        }
+        stopBootloader();   // there is no harm in stopping the bootloader even
+                            // if starting the bootloader failed
+
+        // check if update was successful
+        if (!m_debug) {
+            m_hw->dc_autoRequest(true); //restart dc_autoRequest after download else E255!
         }
 
-        if (jsonNr != 0) {
-            // send one request for every single version
-            // jsonNr=1...36, 1=config file (cust.Nr) 2=devices  3=cash  4=res.
-            //      5=printer template 1 ..... 36= template 32
+        for (int i = 0; i < 3; ++i) {
+            qInfo() << "waiting for device controller restart...(" << i << ")";
+            QThread::sleep(20);
 
-            m_hw->sys_requestJsonVersions(jsonNr);
-            QThread::msleep(500);
-
-            char buf[64];
-            memset(buf, 0x00, sizeof(buf));
-            m_hw->sys_getJsonVersions(jsonNr, buf);
-            buf[16] = '\0'; // the DC only handles 16 bytes
-
-            static const QByteArray cb(16, (char)0xff);
-
-            QString const installedVersion(QString::fromStdString(buf));
-            QString const fileVersion = getFileVersion(jsonFileNames[i]);
-
-            QFileInfo fi(jsonFileNames[i]);
-
-            qCritical() << endl;
-            qCritical() << "                json request nr:" << jsonNr;
-
-            if (installedVersion == fileVersion) {
-                qCritical() << "                      json file:" << fi.fileName();
-                qCritical() << "        installed version in DC:" << installedVersion;
-            } else
-            if (cb == QByteArray(buf) && fileVersion == "") {
-                qCritical() << "unknown json file (repo and DC):" << fi.fileName();
-            } else {
-                qCritical() << "                      json file:" << fi.fileName();
-                qCritical() << "        installed version in DC:" << installedVersion;
-                qCritical() << "     file version in repository:" << fileVersion;
+            resetDeviceController();
+            if (startBootloader()) {
+                qInfo() << nextTimePoint().toUtf8().constData() << "<DC-UPDATE-SUCCESS>";
+                stopBootloader();
+                return -(int)Result::SUCCESS;
             }
-
-        } else {
-            qCritical() << "CANNOT FIND JSON-NR FOR" << fName;
         }
     }
 
+    qInfo() << nextTimePoint().toUtf8().constData() << "<DC-UPDATE-FAILURE>";
+    //To Do Error handling if Dc doesnt start after download
     return false;
 }
-
-
-QString Update::getFileVersion(QString const& jsonFileName) {
-    // "version":"15.10.2023 14:55 02.00.06",
-    static const QRegularExpression re("^.*(\\\"[Vv]ersion\\\":)([\\s\\\"]{0,})([^,\\\"]{0,}).*$");
-
-    QString fileVersion("");
-    QFile inputFile(QDir::cleanPath(m_customerRepository + QDir::separator() + jsonFileName));
-
-    if (inputFile.exists()) {
-        if (inputFile.open(QIODevice::ReadOnly)) {
-           QTextStream in(&inputFile);
-           while (!in.atEnd()) {
-              QString line = in.readLine();
-
-              QRegularExpressionMatch match;
-              int idx = line.indexOf(re, 0, &match);
-              if (idx != -1) {
-                  int const lastCaptured = match.lastCapturedIndex();
-                  // the dc only sends 16 Byte
-                  fileVersion = match.captured(lastCaptured);
-                  fileVersion.truncate(16);
-                  break;
-              }
-           }
-           inputFile.close();
-        }
-    } else {
-        // qCritical() << "ERROR" << inputFile.fileName() << "does not exist";
-    }
-
-    return fileVersion;
-}
-
-bool Update::downloadJson(enum FileTypeJson type,
-                          int templateIdx,
-                          QString jsFileToSendToDC) const {
-
-    m_hw->dc_autoRequest(true); // downloading Json needs the AutoEmission flag
-    qDebug() << "SET AUTO-REQUEST=TRUE";
-    QThread::sleep(1);  // make sure the auto-request flag is acknowledged
-
-    QStringList lst;
-    bool ready = false;
-    int nTry = 25;
-    while ((ready = m_hw->sys_ready4sending()) == false) {
-        QThread::msleep(200);
-        if (--nTry <= 0) {
-            qCritical() << "SYS NOT READY FOR SENDING AFTER 5 SECONDS";
-            break;
-        }
-    }
-
-    bool ret = false;
-    QString msg;
-    lst.clear();
-    if (ready) {
-        QFile file(jsFileToSendToDC);
-        QFileInfo fi(jsFileToSendToDC); // max. size of template file is 800 bytes
-        if (file.exists()) {
-            if (file.open(QIODevice::ReadOnly)) {
-                if (fi.size() > 0 && fi.size() <= 800) {
-                    QByteArray ba = file.readAll();
-                    // kindOfFile: 1=config, 2=device, 3=cash, 4=serial, 5=time, 6=printer
-                    //      nrOfTemplate=1...32 if kindOfFile==6
-                    //      content = content of the Json file, max 800byte ascii signs
-                    if (m_hw->sys_sendJsonFileToDc((uint8_t)(type),
-                                                   templateIdx,
-                                                   (uint8_t *)ba.data())) {
-
-                        /*
-                         *  Note: the machine id is contained in DC2C_conf.json.
-                         *  The idea was to use this to check if the download of
-                         *  the json-file was correct. It did not work, as the
-                         *  update of the PSA (to reflect a change in the
-                         *  machine id) did not happen immediately.
-                         *
-                            m_hw->dc_autoRequest(true);
-                            QThread::msleep(500);
-
-                            // testing
-                            m_hw->request_ReadbackMachineID();
-                            QThread::msleep(500);
-
-                            uint8_t data[64];
-                            memset(data, 0x00, sizeof(data));
-                            uint8_t length = 0;
-
-                            m_hw->readback_machineIDdata(&length, data);
-
-                            QThread::msleep(500);
-
-                            QByteArray ba((const char*)data, length);
-
-                            qCritical() << length << "MACHINE ID =" << ba.toHex(':');
-                        */
-
-                        ret = true;
-                    } else {
-                        qCritical() << QString("ERROR SEND JSON-FILE %1 TO DC").arg(file.fileName());
-                    }
-                } else {
-                    qCritical() << QString("SIZE OF %1 TOO BIG (%2 BYTES)").arg(jsFileToSendToDC).arg(fi.size());
-                }
-            } else {
-                qCritical() << QString("CAN NOT OPEN ") + jsFileToSendToDC + " FOR READING";
-            }
-        } else {
-            qCritical() << (QString(jsFileToSendToDC) + " DOES NOT EXIST");
-        }
-    }
-
-    m_hw->dc_autoRequest(false);
-    qDebug() << "SET AUTO-REQUEST=FALSE";
-    QThread::sleep(1);  // make sure the auto-request flag is acknowledged
-
-    return ret;
-}
-
-bool Update::updatePrinterTemplate(int templateIdx, QString jsFile) const {
-    return downloadJson(FileTypeJson::PRINTER, templateIdx, jsFile);
-}
-
-bool Update::updateConfig(QString jsFile) {
-    return downloadJson(FileTypeJson::CONFIG, 0, jsFile);
-}
-
-bool Update::updateCashConf(QString jsFile) {
-    return downloadJson(FileTypeJson::CASH, 0, jsFile);
-}
-
-bool Update::updateDeviceConf(QString jsFile) {
-    return downloadJson(FileTypeJson::DEVICE, 0, jsFile);
-}
diff --git a/DownloadDCFirmware/update.h b/DownloadDCFirmware/update.h
index daa3037..cc8cbc6 100644
--- a/DownloadDCFirmware/update.h
+++ b/DownloadDCFirmware/update.h
@@ -8,6 +8,8 @@
 #include <QByteArray>
 #include <QProcess>
 #include <QPluginLoader>
+#include <QDateTime>
+#include <cmath>
 
 #include <initializer_list>
 
@@ -15,115 +17,57 @@
 
 #ifdef PTU5
 #define SERIAL_PORT "ttymxc2"
+#define BAUDRATE 115200
 #else
 #define SERIAL_PORT "ttyUSB0"
+#define BAUDRATE 115200
 #endif
 
+class QSerialPort;
 class Update : public QObject {
     Q_OBJECT
 
+    QString m_dcFileName{};
     hwinf *m_hw = nullptr;
-    char const *m_serialInterface;
-    char const *m_baudrate;
-    QString m_customerRepository;
-    QString m_customerNrStr;
-    QString m_branchName;
-    QString m_pluginName;
-    QString m_workingDir;
-    bool m_maintenanceMode;
-    bool m_dryRun;
-    bool m_sys_areDCdataValid;
+    bool m_sys_areDCdataValid{};
+    bool m_debug{false};
+    bool m_noaction;
 
     static QPluginLoader pluginLoader;
 
+    QDateTime m_start;
+    QString nextTimePoint() const {
+        float const secs = m_start.msecsTo(QDateTime::currentDateTime()) / 1000.0;
+        return QStringLiteral("+%1s").arg(secs, 7, 'f', 2, QChar('0'));
+    }
+
 public:
     enum class DownloadResult {OK, ERROR, TIMEOUT, NOP};
-    enum class FileTypeJson {CONFIG=1, DEVICE=2, CASH=3, SERIAL=4, TIME=5, PRINTER=6};
+    enum class Result {SUCCESS=0, PLUGIN_LOAD_ERROR};
 
-    static hwinf *loadDCPlugin(QDir const &plugInDir, QString const &fn);
+    static hwinf *loadDCPlugin(QString const &libCA = "/usr/lib/libCAslave.so");
     static bool unloadDCPlugin();
     static QStringList split(QString line, QChar sep = ',');
 
-
-    explicit Update(QString customerRepository,
-                    QString customerNrStr,
-                    QString branchName,
-                    QString plugInDir,
-                    QString pluginName,
-                    QString workingDir,
-                    bool dryRun = false,
-                    QObject *parent = nullptr,
-                    char const *serialInterface = SERIAL_PORT,
-                    char const *baudrate = "115200");
-
+    explicit Update(QString const &dcBinFile, QString const &libCA, bool debug, bool noaction);
     virtual ~Update() override;
 
-    bool doUpdate(QStringList const &jsonFilesToDownload, bool usbStickDetected = false);
+    int run();
+    static QString dcVersion(QString const &dcBinFile);
 
-    bool updatePrinterTemplate(int templateIdx, QString fname) const;
-    bool updateConfig(QString jsFileToSendToDC);
-    bool updateCashConf(QString jsFileToSendToDC);
-    bool updateDeviceConf(QString jsFileToSendToDC);
+private:
+    DownloadResult sendStatus(int ret) const;
+    DownloadResult sendNextAddress(int bNum) const;
+    DownloadResult sendNextDataBlock(QByteArray const &binary, int bNum) const;
+    bool startBootloader() const;
+    bool stopBootloader() const;
+    QByteArray loadBinaryDCFile(QString const &dcFilename) const;
+    bool resetDeviceController() const;
+    DownloadResult dcDownloadBinary(QByteArray const &b) const;
 
-    bool downloadJson(enum FileTypeJson type, int templateIdx,
-                      QString jsFileToSendToDC) const;
-
-
-    QString getFileVersion(QString const& jsonFileName);
-    bool checkJsonVersions(QStringList const& jsonFileNames =
-                            QStringList(
-                                QList(
-                                    std::initializer_list<QString>{
-                                        QString("etc/psa_config/DC2C_conf.json"),
-                                        QString("etc/psa_config/DC2C_cash.json"),
-                                        QString("etc/psa_config/DC2C_device.json"),
-                                        QString("etc/psa_config/DC2C_print01.json"),
-                                        QString("etc/psa_config/DC2C_print02.json"),
-                                        QString("etc/psa_config/DC2C_print03.json"),
-                                        QString("etc/psa_config/DC2C_print04.json"),
-                                        QString("etc/psa_config/DC2C_print05.json"),
-                                        QString("etc/psa_config/DC2C_print06.json"),
-                                        QString("etc/psa_config/DC2C_print07.json"),
-                                        QString("etc/psa_config/DC2C_print08.json"),
-                                        QString("etc/psa_config/DC2C_print09.json"),
-                                        QString("etc/psa_config/DC2C_print10.json"),
-                                        QString("etc/psa_config/DC2C_print11.json"),
-                                        QString("etc/psa_config/DC2C_print12.json"),
-                                        QString("etc/psa_config/DC2C_print13.json"),
-                                        QString("etc/psa_config/DC2C_print14.json"),
-                                        QString("etc/psa_config/DC2C_print15.json"),
-                                        QString("etc/psa_config/DC2C_print16.json"),
-                                        QString("etc/psa_config/DC2C_print17.json"),
-                                        QString("etc/psa_config/DC2C_print18.json"),
-                                        QString("etc/psa_config/DC2C_print19.json"),
-                                        QString("etc/psa_config/DC2C_print20.json"),
-                                        QString("etc/psa_config/DC2C_print21.json"),
-                                        QString("etc/psa_config/DC2C_print22.json"),
-                                        QString("etc/psa_config/DC2C_print23.json"),
-                                        QString("etc/psa_config/DC2C_print24.json"),
-                                        QString("etc/psa_config/DC2C_print25.json"),
-                                        QString("etc/psa_config/DC2C_print26.json"),
-                                        QString("etc/psa_config/DC2C_print27.json"),
-                                        QString("etc/psa_config/DC2C_print28.json"),
-                                        QString("etc/psa_config/DC2C_print29.json"),
-                                        QString("etc/psa_config/DC2C_print30.json"),
-                                        QString("etc/psa_config/DC2C_print31.json"),
-                                        QString("etc/psa_config/DC2C_print32.json")})));
+    QString m_fileToDownload;
+    uint16_t m_totalBlocks = 0;
 /*
-    bool checkDownloadedJsonVersions(QStringList const& jsonFileNames);
-
-    hwinf *hw() { return m_hw; }
-    hwinf const *hw() const { return m_hw; }
-
-    //QString customerId() { return m_customerId; }
-    //QString const customerId() const { return m_customerId; }
-
-    QString branchName() { return m_branchName; }
-    QString const branchName() const { return m_branchName; }
-
-    //QString repositoryPath() { return m_repositoryPath; }
-    //QString const repositoryPath() const { return m_repositoryPath; }
-
 private:
     static QString jsonType(enum FileTypeJson type);
     bool openSerial(int br, QString baudrate, QString comPort) const;
diff --git a/UpdatePTUDevCtrl/commandline_parser.cpp b/UpdatePTUDevCtrl/commandline_parser.cpp
index 3efb346..b379b28 100644
--- a/UpdatePTUDevCtrl/commandline_parser.cpp
+++ b/UpdatePTUDevCtrl/commandline_parser.cpp
@@ -6,7 +6,9 @@
 #include <QFile>
 
 CommandLineParser::CommandLineParser()
-  : m_repositoryUrl("https://git.mimbach49.de/GerhardHoffmann")
+  : m_repositoryUrl("gitea@ptu-config.atb-comm.de:ATB/")
+  , m_sshKeyFile("/opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig")
+  , m_sshOptionStrictHostKeyChecking("false")
   , m_plugInDir("/usr/lib/")
   , m_plugInName("libCAslave.so")
   , m_workingDir("/opt/app/tools/atbupdate/")
@@ -20,27 +22,36 @@ CommandLineParser::CommandLineParser()
   , m_alwaysDownloadDC("false")
   , m_repositoryUrlOption(
         QCommandLineOption(
-            QStringList() << "repository-url" << "repository-url",
+            QStringList() << "repository-url",
             QCoreApplication::translate("main", "Where to find a customer repository."),
             QCoreApplication::translate("main", "directory")))
+  , m_sshKeyFileOption(
+        QCommandLineOption(
+            QStringList() << "sshKeyFile",
+            QCoreApplication::translate("main", "Used ssh key."),
+            QCoreApplication::translate("main", "file")))
+  , m_sshOptionStrictHostKeyCheckingOption(
+        QCommandLineOption(
+            QStringList() << "sshStrictHostKeyChecking",
+            QCoreApplication::translate("main", "Enable ssh strict host key checking")))
   , m_iniFileDirectoryOption(
         QCommandLineOption(
-            QStringList() << "ini-directory" << "ini-directory",
+            QStringList() << "ini-directory",
             QCoreApplication::translate("main", "Where to find an ini-file."),
             QCoreApplication::translate("main", "directory")))
   , m_iniFileNameOption(
         QCommandLineOption(
-            QStringList() << "ini-filename" << "ini-filename",
+            QStringList() << "ini-filename",
             QCoreApplication::translate("main", "Name of ini-file."),
             QCoreApplication::translate("main", "file")))
   , m_pluginDirectoryOption(
         QCommandLineOption(
-            QStringList() << "plugin-directory" << "plugin-directory",
+            QStringList() << "plugin-directory",
             QCoreApplication::translate("main", "Where to find dc-plugin."),
             QCoreApplication::translate("main", "directory")))
   , m_pluginNameOption(
         QCommandLineOption(
-            QStringList() << "plugin-name" << "plugin-name",
+            QStringList() << "plugin-name",
             QCoreApplication::translate("main", "Name of dc-plugin."),
             QCoreApplication::translate("main", "directory")))
   , m_noDownloadOption(
@@ -57,17 +68,17 @@ CommandLineParser::CommandLineParser()
             QCoreApplication::translate("main", "Always download the dc-bin-file to DC).")))
   , m_workingDirectoryOption(
         QCommandLineOption(
-            QStringList() << "working-directory" << "working-directory",
+            QStringList() << "working-directory",
             QCoreApplication::translate("main", "working directory of update-script."),
             QCoreApplication::translate("main", "directory")))
   , m_psaConfigDirectoryOption(
         QCommandLineOption(
-            QStringList() << "psa-config-directory" << "psa-config-directory",
+            QStringList() << "psa-config-directory",
             QCoreApplication::translate("main", "config directory of json-files sent to dc."),
             QCoreApplication::translate("main", "directory")))
   , m_psaTariffDirectoryOption(
         QCommandLineOption(
-            QStringList() << "psa-tariff-directory" << "psa-tariff-directory",
+            QStringList() << "psa-tariff-directory",
             QCoreApplication::translate("main", "tariff directory of tariff-json-files."),
             QCoreApplication::translate("main", "directory")))
   , m_dryRunOption(
@@ -85,7 +96,17 @@ CommandLineParser::CommandLineParser()
   , m_yoctoInstallStatusOption(
         QCommandLineOption(
             QStringList() << "Y" << "yocto-install",
-            QCoreApplication::translate("main", "Show yocto install status of ATBUpdateTool."))) {
+            QCoreApplication::translate("main", "Show yocto install status of ATBUpdateTool.")))
+  , m_dcDirectoryOption(
+        QCommandLineOption(
+            QStringList() << "dc-directory" << "dc-directory",
+            QCoreApplication::translate("main", "device controller directory."),
+            QCoreApplication::translate("main", "directory")))
+  , m_readDCVersionOption(
+        QCommandLineOption(
+            QStringList() << "D" << "read-dc-version",
+            QCoreApplication::translate("main", "Show version of device controller.")))
+{
     configure();
 }
 
@@ -94,9 +115,15 @@ void CommandLineParser::configure() {
     m_parser.addHelpOption();
     m_parser.addVersionOption();
 
-    m_repositoryUrlOption.setDefaultValue("https://git.mimbach49.de/GerhardHoffmann");
+    m_repositoryUrlOption.setDefaultValue("gitea@ptu-config.atb-comm.de:ATB/");
     m_parser.addOption(m_repositoryUrlOption);
 
+    m_sshKeyFileOption.setDefaultValue("/opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig");
+    m_parser.addOption(m_sshKeyFileOption);
+
+    m_sshOptionStrictHostKeyCheckingOption.setDefaultValue("");
+    m_parser.addOption(m_sshOptionStrictHostKeyCheckingOption);
+
     m_iniFileDirectoryOption.setDefaultValue(QCoreApplication::applicationDirPath());
     m_parser.addOption(m_iniFileDirectoryOption);
 
@@ -138,6 +165,12 @@ void CommandLineParser::configure() {
 
     m_yoctoInstallStatusOption.setDefaultValue("false");
     m_parser.addOption(m_yoctoInstallStatusOption);
+
+    m_dcDirectoryOption.setDefaultValue("etc/dc/");
+    m_parser.addOption(m_dcDirectoryOption);
+
+    m_readDCVersionOption.setDefaultValue("false");
+    m_parser.addOption(m_readDCVersionOption);
 }
 
 void CommandLineParser::readSettings() {
@@ -145,8 +178,8 @@ void CommandLineParser::readSettings() {
     QString const iniFileName = m_parser.value(m_iniFileNameOption);
     m_iniFileName = QDir::cleanPath(iniFileDir + QDir::separator() + iniFileName);
 
-    qCritical() << __PRETTY_FUNCTION__ << " iniFileDir" << iniFileDir;
-    qCritical() << __PRETTY_FUNCTION__ << "iniFileName" << m_iniFileName;
+    //qCritical() << __PRETTY_FUNCTION__ << " iniFileDir" << iniFileDir;
+    //qCritical() << __PRETTY_FUNCTION__ << "iniFileName" << m_iniFileName;
 
     if (!m_iniFileName.isEmpty()) {
         if (QFile(m_iniFileName).exists()) {
@@ -155,12 +188,18 @@ void CommandLineParser::readSettings() {
             for (QString const &key: keys) {
                 QVariant v = settings.value(key);
 
-                qCritical() << __PRETTY_FUNCTION__
-                            << key << " -> " << v.toString();
+                //qCritical() << "(" << __func__ << ":" << __LINE__ << ")"
+                //            << key << " -> " << v.toString();
 
                 if (key.contains("repository-url")) {
                     m_repositoryUrl = v.toString();
                 } else
+                if (key.contains("sshKeyFile")) {
+                    m_sshKeyFile = v.toString();
+                } else
+                if (key.contains("sshOptionStrictHostKeyChecking")) {
+                    m_sshOptionStrictHostKeyChecking = (v.toBool() ? "true" : "false");
+                } else
                 if (key.contains("plugin-directory")) {
                     m_plugInDir = v.toString();
                 } else
@@ -196,6 +235,12 @@ void CommandLineParser::readSettings() {
                 } else
                 if (key.contains("plugin-name")) {
                     m_plugInName = v.toString();
+                } else
+                if (key.contains("dc-directory")) {
+                    m_dcDir = v.toString();
+                } else
+                if (key.contains("read-dc-version")) {
+                    m_readDCVersion = (v.toBool() ? "true" : "false");
                 } else {
                     qCritical() << __PRETTY_FUNCTION__
                                 << key << " -> (UNKNOWN) " << v.toString();
@@ -215,6 +260,21 @@ QString CommandLineParser::repositoryUrl() {
     return m_repositoryUrl;
 }
 
+QString CommandLineParser::sshKeyFile() {
+    if (m_parser.isSet(m_sshKeyFileOption)) {
+        m_sshKeyFile = m_parser.value(m_sshKeyFileOption);
+    }
+    return m_sshKeyFile;
+}
+
+bool CommandLineParser::sshOptionStrictHostKeyChecking()
+{
+    if (m_parser.isSet(m_sshOptionStrictHostKeyCheckingOption)) {
+        m_sshOptionStrictHostKeyChecking = m_parser.value(m_sshOptionStrictHostKeyCheckingOption);
+    }
+    return m_sshOptionStrictHostKeyChecking == "false" ? false : true;
+}
+
 QString CommandLineParser::plugInDir() {
     if (m_parser.isSet(m_pluginDirectoryOption)) {
         m_plugInDir = m_parser.value(m_pluginDirectoryOption);
@@ -243,6 +303,20 @@ QString CommandLineParser::psaTariffDir() {
     return m_psaTariffDir;
 }
 
+QString CommandLineParser::dcDir() {
+    if (m_parser.isSet(m_dcDirectoryOption)) {
+        m_dcDir = m_parser.value(m_dcDirectoryOption);
+    }
+    return m_dcDir;
+}
+
+bool CommandLineParser::readDCVersion() {
+    if (m_parser.isSet(m_readDCVersionOption)) {
+        m_readDCVersion = m_parser.value(m_readDCVersionOption);
+    }
+    return m_readDCVersion == "false" ? false : true;
+}
+
 QString CommandLineParser::workingDir() {
     if (m_parser.isSet(m_workingDirectoryOption)) {
         m_workingDir = m_parser.value(m_workingDirectoryOption);
@@ -288,9 +362,9 @@ bool CommandLineParser::extendedVersion() {
 bool CommandLineParser::alwaysDownloadConfig() {
     if (m_parser.isSet(m_alwaysDownloadConfigOption)) {
         m_alwaysDownloadConfig = m_parser.value(m_alwaysDownloadConfigOption);
-        qCritical() << "m_alwaysDownloadConfigOption IS SET" << m_alwaysDownloadConfig;
+        // qCritical() << "m_alwaysDownloadConfigOption IS SET" << m_alwaysDownloadConfig;
     }
-    qCritical() << "m_alwaysDownloadConfig" << m_alwaysDownloadConfig;
+    // qCritical() << "m_alwaysDownloadConfig" << m_alwaysDownloadConfig;
     return m_alwaysDownloadConfig == "false" ? false : true;
 }
 
diff --git a/UpdatePTUDevCtrl/commandline_parser.h b/UpdatePTUDevCtrl/commandline_parser.h
index 22f906a..9e577c1 100644
--- a/UpdatePTUDevCtrl/commandline_parser.h
+++ b/UpdatePTUDevCtrl/commandline_parser.h
@@ -1,4 +1,4 @@
-#ifndef COMMAND_LINE_PARSER_H_INCLUDED
+#ifndef COMMAND_LINE_PARSER_H_INCLUDED
 #define COMMAND_LINE_PARSER_H_INCLUDED
 
 #include <QCoreApplication>
@@ -8,11 +8,13 @@
 
 class CommandLineParser : public QCommandLineParser {
     QString m_repositoryUrl;
+    QString m_sshKeyFile;
+    QString m_sshOptionStrictHostKeyChecking;
     QString m_plugInDir;
     QString m_plugInName;
     QString m_workingDir;
-    QString m_psaConfigDir;
-    QString m_psaTariffDir;
+    QString m_psaConfigDir{"etc/psa_config"};
+    QString m_psaTariffDir{"etc/psa_tariff"};
     QString m_dryRun;
     QString m_noUpdatePsaHardware;
     QString m_showYoctoVersion;
@@ -21,8 +23,12 @@ class CommandLineParser : public QCommandLineParser {
     QString m_iniFileName;
     QString m_alwaysDownloadConfig;
     QString m_alwaysDownloadDC;
+    QString m_readDCVersion{"false"};
+    QString m_dcDir{"etc/dc/"};
 
     QCommandLineOption m_repositoryUrlOption;
+    QCommandLineOption m_sshKeyFileOption;
+    QCommandLineOption m_sshOptionStrictHostKeyCheckingOption;
     QCommandLineOption m_iniFileDirectoryOption;
     QCommandLineOption m_iniFileNameOption;
     QCommandLineOption m_pluginDirectoryOption;
@@ -37,6 +43,8 @@ class CommandLineParser : public QCommandLineParser {
     QCommandLineOption m_extendedVersionOption;
     QCommandLineOption m_yoctoVersionOption;
     QCommandLineOption m_yoctoInstallStatusOption;
+    QCommandLineOption m_dcDirectoryOption;
+    QCommandLineOption m_readDCVersionOption;
 
     QCommandLineParser m_parser;
 
@@ -53,6 +61,8 @@ public:
     QString const &iniFileName() const { return m_iniFileName; }
     void readSettings();
     QString repositoryUrl();
+    QString sshKeyFile();
+    bool sshOptionStrictHostKeyChecking();
     QString plugInDir();
     QString plugInName();
     QString workingDir();
@@ -65,5 +75,7 @@ public:
     bool extendedVersion();
     bool alwaysDownloadConfig();
     bool alwaysDownloadDC();
+    bool readDCVersion();
+    QString dcDir();
 };
 #endif // COMMAND_LINE_PARSER_H_INCLUDED
diff --git a/UpdatePTUDevCtrl/git/git_client.cpp b/UpdatePTUDevCtrl/git/git_client.cpp
index e194ad6..0eac2aa 100644
--- a/UpdatePTUDevCtrl/git/git_client.cpp
+++ b/UpdatePTUDevCtrl/git/git_client.cpp
@@ -2,6 +2,7 @@
 #include "update.h"
 #include "worker.h"
 #include "utils.h"
+#include "process/command.h"
 
 #include <QRegularExpression>
 #include <QDebug>
@@ -399,6 +400,12 @@ std::optional<QString> GitClient::gitPull() {
         If remote host keys are changed, then
 
         export GIT_SSH_COMMAND="ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig"
+
+        ... or ignore host key checking:
+        export GIT_SSH_COMMAND="ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig -o StrictHostKeyChecking=no"
+
+        ... or use separate known_hosts file:
+        export GIT_SSH_COMMAND="ssh -i /mypath/.keys/id_ed25519 -o StrictHostKeyChecking=yes -o UserKnownHostsFile=/opt/app/tools/atbupdate/.keys/known_hosts
         git pull
 
         leads to the following warning/error message:
diff --git a/UpdatePTUDevCtrl/git/git_client.h b/UpdatePTUDevCtrl/git/git_client.h
index 31e5001..d7000e3 100644
--- a/UpdatePTUDevCtrl/git/git_client.h
+++ b/UpdatePTUDevCtrl/git/git_client.h
@@ -4,8 +4,8 @@
 #include <QObject>
 #include <QStringList>
 #include <optional>
+#include <QCoreApplication>
 
-#include "process/command.h"
 #include "ismas/ismas_client.h"
 
 class Worker;
diff --git a/UpdatePTUDevCtrl/main.cpp b/UpdatePTUDevCtrl/main.cpp
index c3e8cba..524f82c 100644
--- a/UpdatePTUDevCtrl/main.cpp
+++ b/UpdatePTUDevCtrl/main.cpp
@@ -31,6 +31,7 @@
 #include "worker.h"
 #include "mainwindow.h"
 #include "utils.h"
+// #include "process/command.h"
 
 #include <QThread>
 #include <QtWidgets>
@@ -71,39 +72,43 @@ int main(int argc, char *argv[]) {
 
     CommandLineParser parser;
     parser.process(a);
+
+    if (parser.isSet(parser.addHelpOption())) {
+       parser.showHelp(0);
+       return 0;
+    }
+
     parser.readSettings();
 
     QString repositoryUrl = parser.repositoryUrl();
+    QString sshKeyFile    = parser.sshKeyFile();
+    bool strictHostKeyChecking = parser.sshOptionStrictHostKeyChecking();
 
     if (repositoryUrl.endsWith('/')) {
         repositoryUrl.chop(1);
     }
 
-    QString gitSSHCommand("");
+    // default for gitSSHCommand
+    QString gitSSHCommand = "ssh -i " + sshKeyFile;
 
-    if (repositoryUrl.contains("ptu-config.atb-comm.de")) {
-        QByteArray const v = qgetenv("GIT_SSH_COMMAND");
-        if (v.isEmpty()) {
-            QString sshKeyFile("/opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig");
-            if (QFileInfo(sshKeyFile).exists()) {
-                gitSSHCommand = "ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig";
-                if (!qputenv("GIT_SSH_COMMAND", QByteArray(gitSSHCommand.toStdString().c_str()))) {
-                    qCritical() << "ERROR: GIT_SSH_COMMAND not put into env. Exiting...";
-                    return -1;
-                }
-            } else {
-                qCritical() << "ERROR ssh-key-file" << sshKeyFile << "does not exists. Exiting...";
+    strictHostKeyChecking ? gitSSHCommand.append(" -o StrictHostKeyChecking=yes")
+                          : gitSSHCommand.append(" -o StrictHostKeyChecking=no");
+
+    QByteArray const v = qgetenv("GIT_SSH_COMMAND");
+    if (v.isEmpty()) {
+        if (QFileInfo(sshKeyFile).exists()) {
+            if (!qputenv("GIT_SSH_COMMAND", QByteArray(gitSSHCommand.toStdString().c_str()))) {
+                qCritical() << "ERROR: GIT_SSH_COMMAND not put into env. Exiting...";
                 return -1;
             }
         } else {
-            gitSSHCommand = QString(v.toStdString().c_str());
-            qCritical() << "WARNING GIT_SSH_COMMAND already set in enviroment:"
-                        << gitSSHCommand;
-            if (gitSSHCommand != "ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig") {
-                qCritical() << "ERROR" << gitSSHCommand << "wrong. Exiting...";
-                return -1;
-            }
+            qCritical() << "ERROR ssh-key-file" << sshKeyFile << "does not exists. Exiting...";
+            return -1;
         }
+    } else {
+        gitSSHCommand = QString(v.toStdString().c_str());
+        qCritical() << "WARNING GIT_SSH_COMMAND already set in enviroment:"
+                    << gitSSHCommand;
     }
 
     QString plugInDir = parser.plugInDir();
@@ -160,7 +165,6 @@ int main(int argc, char *argv[]) {
         return 0;
     }
 
-
     QThread::currentThread()->setObjectName("main thread");
     qInfo() << "Main thread" << QThread::currentThreadId();
 
@@ -199,5 +203,9 @@ int main(int argc, char *argv[]) {
     mw.setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
     mw.showFullScreen();
 
+    // test
+    worker.dcUpdate();
+    // worker.summary();
+
     return a.exec();
 }
diff --git a/UpdatePTUDevCtrl/mainwindow.cpp b/UpdatePTUDevCtrl/mainwindow.cpp
index 1d69513..c17b24d 100644
--- a/UpdatePTUDevCtrl/mainwindow.cpp
+++ b/UpdatePTUDevCtrl/mainwindow.cpp
@@ -11,6 +11,8 @@
 #include <QDebug>
 #include <QScrollBar>
 #include <QEvent>
+#include <QColor>
+#include <QColorDialog>
 
 #include <QScreen>
 
@@ -24,17 +26,17 @@ MainWindow::MainWindow(Worker *worker, QWidget *parent)
     , m_progressRunning(false)
     , m_updateStep(UpdateDcEvent::UpdateStep::NONE) {
 
+    ui->setupUi(this);
+    checkOrientation();
+
     this->setStatusBar(new QStatusBar(this));
     QFont f;
     f.setStyleHint(QFont::Monospace);
     f.setWeight(QFont::Bold);
     f.setFamily("Misc Fixed");
-    f.setPixelSize(12);
+    f.setPointSize(11);
     this->statusBar()->setFont(f);
 
-    ui->setupUi(this);
-    checkOrientation();
-
     ui->updateProgress->setRange(0, 100);
     ui->updateProgress->reset();
 
@@ -42,15 +44,15 @@ MainWindow::MainWindow(Worker *worker, QWidget *parent)
     QString start = QDateTime::currentDateTime().toString(Qt::ISODate);
     lst << QString("Start: ") + start.leftJustified(m_width-10);
     lst << QString("").leftJustified(m_width-3, '=');
-    lst << QString("Update tool version: %1 - %2 %3").arg(APP_VERSION).arg(APP_BUILD_DATE).arg(APP_BUILD_TIME).leftJustified(m_width-3);
-    lst << QString("Machine number     : %1 ").arg(m_worker->machineNr()).leftJustified(m_width-3);
-    lst << QString("Customer number    : %1 ").arg(m_worker->customerNr()).leftJustified(m_width-3);
-    lst << QString("Zone number        : %1 (%2)").arg(m_worker->zoneNr()).arg(Utils::zoneName(m_worker->zoneNr())).leftJustified(m_width-3);
-    lst << QString("APISM version      : %1").arg(m_worker->apismVersion()).leftJustified(m_width-3);
+    lst << QString("Update tool version     : %1 - %2 %3").arg(APP_VERSION).arg(APP_BUILD_DATE).arg(APP_BUILD_TIME).leftJustified(m_width-3);
+    lst << QString("Machine number          : %1 ").arg(m_worker->machineNr()).leftJustified(m_width-3);
+    lst << QString("Customer number         : %1 ").arg(m_worker->customerNr()).leftJustified(m_width-3);
+    lst << QString("Zone number             : %1 (%2)").arg(m_worker->zoneNr()).arg(Utils::zoneName(m_worker->zoneNr())).leftJustified(m_width-3);
+    lst << QString("APISM version           : %1").arg(m_worker->apismVersion()).leftJustified(m_width-3);
     lst << QString("").leftJustified(m_width-3, '=');
 
-    ui->updateStatus->setText(lst.join('\n'));
-    ui->updateStatus->setEnabled(true);
+    ui->updateLabel->setText(lst.join('\n'));
+    ui->updateLabel->setEnabled(true);
     // ui->updateStatus->installEventFilter(this);
 
     m_startTimer = new QTimer(this);
@@ -82,11 +84,15 @@ MainWindow::MainWindow(Worker *worker, QWidget *parent)
     }
 
     connect(ui->exit, SIGNAL(clicked()),this,SLOT(onQuit()));
+    connect(m_worker, SIGNAL(showSummary(QString)),this,SLOT(onShowSummary(QString)));
     connect(m_worker, SIGNAL(disableExit()),this,SLOT(onDisableExit()));
+    connect(m_worker, SIGNAL(showDcDownload(QString)),this,SLOT(onShowDcDownload(QString)));
+    connect(m_worker, SIGNAL(setDcDownloadProgress(int)),this,SLOT(onSetDcDownloadProgress(int)));
     connect(m_worker, SIGNAL(enableExit()),this,SLOT(onEnableExit()));
     connect(m_worker, SIGNAL(stopStartTimer()),this,SLOT(onStopStartTimer()));
     connect(m_worker, SIGNAL(restartExitTimer()),this,SLOT(onRestartExitTimer()));
     connect(m_worker, SIGNAL(appendText(QString,QString)),this,SLOT(onAppendText(QString,QString)));
+    connect(m_worker, SIGNAL(insertText(QString)),this,SLOT(onInsertText(QString)), Qt::DirectConnection);
     connect(m_worker, SIGNAL(showErrorMessage(QString,QString)),this, SLOT(onShowErrorMessage(QString,QString)));
     connect(m_worker, SIGNAL(showStatusMessage(QString,QString)),this, SLOT(onShowStatusMessage(QString,QString)));
     connect(m_worker, SIGNAL(showErrorMessage(QStringList)),this, SLOT(onShowErrorMessage(QStringList)));
@@ -95,6 +101,29 @@ MainWindow::MainWindow(Worker *worker, QWidget *parent)
     connect(m_worker, SIGNAL(replaceLast(QStringList,QString)),this, SLOT(onReplaceLast(QStringList,QString)));
 }
 
+
+void MainWindow::onShowSummary(QString text) {
+    // QString s = ui->updateLabel->text();
+    QString s("\n");
+
+    ui->updateLabel->setText(s);
+    ui->updateLabel->hide();
+    ui->stepLabel->hide();
+
+    s += text;
+    ui->updateStatus->setText(s);
+}
+
+void MainWindow::onSetDcDownloadProgress(int v) {
+    ui->updateProgress->setValue(v);
+}
+
+void MainWindow::onShowDcDownload(QString version) {
+    m_targetDcVersion = version;
+    ui->exit->setEnabled(false);
+    ui->stepLabel->setText(QString("Device controller update. Target version: %1").arg(version).leftJustified(m_width-3));
+}
+
 MainWindow::~MainWindow() {
     delete m_startTimer;
     delete m_exitTimer;
@@ -253,6 +282,12 @@ void MainWindow::scrollDownTextEdit() {
     ui->updateStatus->ensureCursorVisible();
 }
 
+
+void MainWindow::onInsertText(QString text) {
+    scrollDownTextEdit();
+    ui->updateStatus->textCursor().insertText(text);
+}
+
 void MainWindow::onAppendText(QString text, QString suffix) {
     // Utils::printInfoMsg(QString("ON APPEND CALLED AT ")
     //    + QDateTime::currentDateTime().toString(Qt::ISODateWithMs));
diff --git a/UpdatePTUDevCtrl/mainwindow.h b/UpdatePTUDevCtrl/mainwindow.h
index 4a80d18..d128d03 100644
--- a/UpdatePTUDevCtrl/mainwindow.h
+++ b/UpdatePTUDevCtrl/mainwindow.h
@@ -36,8 +36,11 @@ public:
     UpdateDcEvent::UpdateStep updateStep() const { return m_updateStep; }
     void setUpdateStep(UpdateDcEvent::UpdateStep updateStep) { m_updateStep = updateStep; }
 
+    QString targetDcVersion() {return  m_targetDcVersion; }
+
 public slots:
     void onAppendText(QString, QString suffix = "");
+    void onInsertText(QString);
     void onReplaceLast(QStringList, QString suffix = "");
     void onReplaceLast(QString, QString suffix = "");
     void onShowErrorMessage(QString, QString);
@@ -48,6 +51,9 @@ public slots:
     void onRestartExitTimer();
     void onEnableExit();
     void onDisableExit();
+    void onShowDcDownload(QString);
+    void onSetDcDownloadProgress(int);
+    void onShowSummary(QString);
 #if EMERGENCY_LEAVE_BL==1
     void emergencyLeaveBL();
 #endif
@@ -80,5 +86,6 @@ private:
     //int m_progressValue;
     UpdateDcEvent::UpdateStep m_updateStep;
     QTimer *m_statusTimer;
+    QString m_targetDcVersion;
 };
 #endif // MAINWINDOW_H
diff --git a/UpdatePTUDevCtrl/mainwindow.ui b/UpdatePTUDevCtrl/mainwindow.ui
index 82fa12e..f88b4c1 100644
--- a/UpdatePTUDevCtrl/mainwindow.ui
+++ b/UpdatePTUDevCtrl/mainwindow.ui
@@ -18,54 +18,117 @@
   </property>
   <property name="font">
    <font>
-    <family>Source Code Pro</family>
+    <family>Misc Fixed</family>
+    <pointsize>11</pointsize>
+    <weight>75</weight>
+    <bold>true</bold>
    </font>
   </property>
   <property name="windowTitle">
    <string>MainWindow</string>
   </property>
   <widget class="QWidget" name="centralwidget">
-   <layout class="QVBoxLayout" name="verticalLayout">
-    <item>
-     <layout class="QGridLayout" name="gridLayout">
-      <item row="3" column="2">
-       <widget class="QPushButton" name="exit">
-        <property name="text">
-         <string>Exit</string>
-        </property>
-       </widget>
-      </item>
-      <item row="3" column="1">
-       <widget class="QProgressBar" name="updateProgress">
-        <property name="value">
-         <number>1</number>
-        </property>
-       </widget>
-      </item>
-      <item row="0" column="0" rowspan="3" colspan="3">
-       <widget class="QTextEdit" name="updateStatus">
-        <property name="enabled">
-         <bool>true</bool>
-        </property>
-        <property name="font">
-         <font>
-          <family>Misc Fixed</family>
-          <pointsize>11</pointsize>
-          <weight>75</weight>
-          <bold>true</bold>
-         </font>
-        </property>
-        <property name="verticalScrollBarPolicy">
-         <enum>Qt::ScrollBarAsNeeded</enum>
-        </property>
-        <property name="horizontalScrollBarPolicy">
-         <enum>Qt::ScrollBarAsNeeded</enum>
-        </property>
-       </widget>
-      </item>
-     </layout>
-    </item>
-   </layout>
+   <widget class="QWidget" name="layoutWidget">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>10</y>
+      <width>781</width>
+      <height>441</height>
+     </rect>
+    </property>
+    <layout class="QGridLayout" name="gridLayout">
+     <item row="2" column="0" colspan="3">
+      <widget class="QLabel" name="stepLabel">
+       <property name="minimumSize">
+        <size>
+         <width>0</width>
+         <height>18</height>
+        </size>
+       </property>
+       <property name="font">
+        <font>
+         <family>Misc Fixed</family>
+         <pointsize>11</pointsize>
+         <weight>75</weight>
+         <bold>true</bold>
+        </font>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+      </widget>
+     </item>
+     <item row="3" column="0" colspan="3">
+      <widget class="QTextEdit" name="updateStatus">
+       <property name="enabled">
+        <bool>true</bool>
+       </property>
+       <property name="font">
+        <font>
+         <family>Misc Fixed</family>
+         <pointsize>11</pointsize>
+         <weight>75</weight>
+         <bold>true</bold>
+        </font>
+       </property>
+       <property name="focusPolicy">
+        <enum>Qt::NoFocus</enum>
+       </property>
+       <property name="frameShape">
+        <enum>QFrame::WinPanel</enum>
+       </property>
+       <property name="verticalScrollBarPolicy">
+        <enum>Qt::ScrollBarAsNeeded</enum>
+       </property>
+       <property name="horizontalScrollBarPolicy">
+        <enum>Qt::ScrollBarAsNeeded</enum>
+       </property>
+       <property name="sizeAdjustPolicy">
+        <enum>QAbstractScrollArea::AdjustToContents</enum>
+       </property>
+       <property name="undoRedoEnabled">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0" rowspan="2" colspan="3">
+      <widget class="QLabel" name="updateLabel">
+       <property name="minimumSize">
+        <size>
+         <width>0</width>
+         <height>100</height>
+        </size>
+       </property>
+       <property name="font">
+        <font>
+         <family>Misc Fixed</family>
+         <pointsize>11</pointsize>
+         <weight>75</weight>
+         <bold>true</bold>
+        </font>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+      </widget>
+     </item>
+     <item row="4" column="0" colspan="2">
+      <widget class="QProgressBar" name="updateProgress">
+       <property name="value">
+        <number>1</number>
+       </property>
+      </widget>
+     </item>
+     <item row="4" column="2">
+      <widget class="QPushButton" name="exit">
+       <property name="text">
+        <string>Exit</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </widget>
   </widget>
  </widget>
  <resources/>
diff --git a/UpdatePTUDevCtrl/process/command.cpp b/UpdatePTUDevCtrl/process/command.cpp
index 8e0cf68..b0b8747 100644
--- a/UpdatePTUDevCtrl/process/command.cpp
+++ b/UpdatePTUDevCtrl/process/command.cpp
@@ -1,33 +1,86 @@
 #include "command.h"
+#include "worker.h"
 
 #include <QProcess>
 #include <QDebug>
 #include <QDir>
 #include <QRegularExpression>
 #include <QDateTime>
+#include <QMutexLocker>
+
 
 Command::Command(QString const &command, int start_timeout, int finish_timeout)
     : m_command(command.trimmed())
     , m_commandResult("")
     , m_waitForStartTimeout(start_timeout)
     , m_waitForFinishTimeout(finish_timeout)
-    , m_exitCode(-1) {
+    , m_exitCode(-1)
+    , m_p(nullptr)
+    , m_worker(nullptr) {
 }
 
-QString Command::getCommandResult() const {
-    return m_commandResult;
+QString Command::getCommandResult(bool reset) const {
+    QMutexLocker locker(&m_mtx);
+
+    if (reset == false) {
+        return m_commandResult;
+    }
+
+    QString commandResult = m_commandResult;
+    m_commandResult.clear();
+
+    return commandResult;
 }
 
 void Command::readyReadStandardOutput() {
+    QMutexLocker locker(&m_mtx);
     QProcess *p = (QProcess *)sender();
-    m_commandResult += p->readAllStandardOutput();
-    // qCritical() << m_commandResult;
+    if (p) {
+        QString s = p->readAllStandardOutput();
+        if (m_worker) {
+            int i = -1;
+            if ((i = s.indexOf("<DC-VERSION>")) != -1) {
+                s = s.mid(i+12).trimmed();
+                if ((i = s.indexOf("\"")) != -1) {
+                    s = s.mid(i+1);
+                    if ((i = s.indexOf("\"")) != -1) {
+                        s = s.mid(0, i).trimmed();
+                    }
+                }
+                emit m_worker->showDcDownload(s);
+            } else
+            if ((i = s.indexOf("<PROGRESS>")) != -1) {
+                bool ok;
+                int v = s.mid(i+10).trimmed().toInt(&ok);
+                if (ok) {
+                    emit m_worker->setDcDownloadProgress(v);
+                    emit m_worker->insertText(s.mid(0,i) + "\n");
+                }
+            } else
+            if ((i = s.indexOf("<DC-UPDATE-FINISH>")) != -1) {
+                m_worker->summary();
+                // qApp->exit(0);
+            } else
+            if ((i = s.indexOf("<DC-UPDATE-SUCCESS>")) != -1) {
+                m_worker->summary();
+            } else
+            if ((i = s.indexOf("<DC-UPDATE-FAILURE>")) != -1) {
+                m_worker->summary();
+                //qApp->exit(-1);
+            } else {
+                emit m_worker->insertText(s);
+            }
+        }
+        m_commandResult += s;
+    }
 }
 
 void Command::readyReadStandardError() {
     QProcess *p = (QProcess *)sender();
-    QByteArray buf = p->readAllStandardError();
-    qCritical() << buf;
+    if (p) {
+        QByteArray buf = p->readAllStandardError();
+        qCritical() << buf;
+    }
 }
 
 void Command::finished(int /*exitCode*/, QProcess::ExitStatus /*exitStatus*/) {
@@ -35,12 +88,38 @@ void Command::finished(int /*exitCode*/, QProcess::ExitStatus /*exitStatus*/) {
     // read all remaining data sent to the process, just in case
     QString d = p->readAllStandardOutput();
     if (!d.isEmpty()) {
+        QMutexLocker locker(&m_mtx);
         m_commandResult += d;
     }
     disconnect(p, SIGNAL(finished(int,QProcess::ExitStatus)), this, SLOT(readyReadStandardOutput()));
     disconnect(p, SIGNAL(finished(int,QProcess::ExitStatus)), this, SLOT(readyReadStandardError()));
 }
 
+bool Command::start(QString workingDirectory, QStringList args) {
+    if (!QDir::setCurrent(workingDirectory)) {
+        qCritical() << "SET WORKING_DIRECTORY" << workingDirectory
+                    << "FAILED FOR" << m_command;
+        return false;
+    }
+    if (m_p != nullptr) {
+        delete m_p;
+    }
+    m_p = new QProcess(this);
+    m_p->setWorkingDirectory(workingDirectory);
+    m_p->setProcessChannelMode(QProcess::MergedChannels);
+
+    connect(m_p, SIGNAL(readyReadStandardOutput()), this, SLOT(readyReadStandardOutput()));
+    connect(m_p, SIGNAL(readyReadStandardError()), this, SLOT(readyReadStandardError()));
+
+    if (!args.isEmpty()) {
+        m_p->start(m_command, args);
+    } else {
+        m_p->start(m_command);
+    }
+
+    return m_p->waitForStarted(m_waitForStartTimeout);
+}
+
 bool Command::execute(QString workingDirectory, QStringList args) {
 
     if (!QDir::setCurrent(workingDirectory)) {
diff --git a/UpdatePTUDevCtrl/process/command.h b/UpdatePTUDevCtrl/process/command.h
index bc796ee..71efb22 100644
--- a/UpdatePTUDevCtrl/process/command.h
+++ b/UpdatePTUDevCtrl/process/command.h
@@ -7,27 +7,34 @@
 #include <QString>
 #include <QStringList>
 #include <QProcess>
+#include <QMutex>
 
-
+class Worker;
 class Command : public QObject {
     Q_OBJECT
 
     QString m_command;
-    QString m_commandResult;
+    mutable QString m_commandResult;
     int m_waitForStartTimeout;
     int m_waitForFinishTimeout;
     int m_exitCode;
+    mutable QMutex m_mtx;
+    QProcess *m_p;
+    Worker *m_worker;
 public:
     explicit Command(QString const &command,
                      int start_timeout = 100000,
                      int finish_timeout = 100000);
 
-    QString getCommandResult() const;
+    QString getCommandResult(bool reset = false) const;
     QString command() const { return m_command; }
 
     bool execute(QString workingDirectory, QStringList args = QStringList());
+    bool start(QString workingDirectory, QStringList args = QStringList());
     int exitCode() const { return m_exitCode; }
 
+    void setWorker(Worker *worker) {m_worker = worker; }
+
 private slots:
     void readyReadStandardOutput();
     void readyReadStandardError();
diff --git a/UpdatePTUDevCtrl/update.cpp b/UpdatePTUDevCtrl/update.cpp
index 5b9d376..837e467 100644
--- a/UpdatePTUDevCtrl/update.cpp
+++ b/UpdatePTUDevCtrl/update.cpp
@@ -133,36 +133,6 @@ Update::Update(Worker *worker,
 
         qCritical() << "(" << __func__ << ":" << __LINE__ << ") m_sys_areDCDataValid ..."
                     << m_sys_areDCdataValid;
-
-#if 0
-        QObject const *obj = m_hw->getAPI();
-        Q_ASSERT(obj != nullptr);
-
-        QDebug critical = qCritical();
-        critical << "connect() to onReportDCDownloadStatus() ...";
-        if (!connect(obj,
-                     SIGNAL(hwapi_reportDCDownloadStatus(QString const&)),
-                     this,
-                     SLOT(onReportDCDownloadStatus(QString const &)))) {
-            critical << "FAILED";
-        } else critical << "DONE";
-
-        critical = qCritical();
-        critical << "connect() to onReportDCDownloadSuccess() ...";
-        if (!connect(obj,
-            SIGNAL(hwapi_reportDCDownloadSuccess(QString const&)), this,
-            SLOT(onReportDCDownloadSuccess(QString const &)))) {
-            critical << "FAILED";
-        } else critical << "DONE";
-
-        critical = qCritical();
-        critical << "connect() to onReportDCDownloadFailure() ...";
-        if (!connect(obj,
-            SIGNAL(hwapi_reportDCDownloadFailure(QString const &)), this,
-            SLOT(onReportDCDownloadFailure(QString const &)))) {
-            critical << "FAILED";
-        } else critical << "DONE";
-#endif
     }
 }
 
@@ -302,7 +272,14 @@ bool Update::isSerialOpen() const {
                         // bootloader is really not running anymore.
  */
 bool Update::updateBinary(QString const &fileToSendToDC) {
-    qInfo() << "UPDATING DEVICE CONTROLLER FIRMWARE BINARY" << fileToSendToDC;
+
+    QFile dc("/opt/app/tools/atbupdate/ATBDownloadDCFirmware");
+    if (dc.exists()) {
+        qCritical() << "ERROR: dc-binary does not exist" << fileToSendToDC;
+        return false;
+    }
+
+    qInfo() << "updating dc-binary" << fileToSendToDC << "...";
 
     return false;
 
diff --git a/UpdatePTUDevCtrl/utils.cpp b/UpdatePTUDevCtrl/utils.cpp
index 010b838..7b7ec65 100644
--- a/UpdatePTUDevCtrl/utils.cpp
+++ b/UpdatePTUDevCtrl/utils.cpp
@@ -13,9 +13,65 @@
 #include <QDir>
 #include <QDirIterator>
 #include <QRegularExpression>
+#include <QProcess>
+#include <QJsonDocument>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QJsonArray>
 
 #include <fstream>
 
+QVector<QPair<QString, QString>> Utils::installedPackages() {
+    QVector<QPair<QString, QString>> vec;
+    if (QFile::exists("/usr/bin/ptuPackageVersions")) {
+        QProcess p;
+        QStringList params;
+        params << "-c" << R"(/usr/bin/ptuPackageVersions -i -o json)";
+
+        p.start("bash", params);
+        p.waitForFinished();
+
+        QString r = p.readAllStandardOutput();
+
+        // ptuPackageVersions returns a json-array
+        QJsonArray const &ja = QJsonDocument::fromJson(r.remove(QRegExp("\\n")).toUtf8()).array();
+        if (!ja.empty()) {
+            qCritical() << __LINE__;
+            // transform the array into an object, containing the objects
+            // of the array (christian needs it this way)
+            foreach (QJsonValue const &value, ja) {
+                if (value.isObject()) {
+                    QJsonObject obj = value.toObject();
+                    QStringList keys = obj.keys();
+                    if (!keys.isEmpty()) {
+                        QString const &k = keys.first();
+                        QJsonValue const &v = obj.value(k);
+                        if (v.isObject()) {
+                            obj = v.toObject();
+                            if (obj.keys().contains("Version")) {
+                                QJsonValue const &w = obj.value("Version");
+                                if (w.isString()) {
+                                    QString s = w.toString();
+                                    QPair<QString, QString> p(k, s);
+                                    vec.push_back(p);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        } else {
+            qCritical() << __func__ << ":" << __LINE__
+                        << "ERROR array return by ptuPackageVersions empty";
+        }
+    } else {
+        qCritical() << __func__ << ":" << __LINE__
+                    << "ERROR executing ptuPackageVersions";
+    }
+
+    return vec;
+}
+
 int Utils::read1stLineOfFile(QString fileName) {
     QFile f(fileName);
     if (f.exists()) {
diff --git a/UpdatePTUDevCtrl/utils.h b/UpdatePTUDevCtrl/utils.h
index 8fdd648..a5c93c1 100644
--- a/UpdatePTUDevCtrl/utils.h
+++ b/UpdatePTUDevCtrl/utils.h
@@ -9,6 +9,7 @@
 #include <QDateTime>
 #include <QDir>
 #include <QDebug>
+#include <QPair>
 
 namespace Utils {
     int read1stLineOfFile(QString fileName);
@@ -33,6 +34,8 @@ namespace Utils {
 
     QString getParentName();
     bool isATBQTRunning();
+
+    QVector<QPair<QString, QString>> installedPackages();
 }
 
 #endif // UTILS_H_INCLUDED
diff --git a/UpdatePTUDevCtrl/worker.cpp b/UpdatePTUDevCtrl/worker.cpp
index 8c1a12a..4cddd9d 100644
--- a/UpdatePTUDevCtrl/worker.cpp
+++ b/UpdatePTUDevCtrl/worker.cpp
@@ -26,6 +26,7 @@
 #include "progress_event.h"
 #include "mainwindow.h"
 #include "utils.h"
+#include "process/command.h"
 
 QString const Worker::UPDATE_STEP_OK     (   " [  ok]");
 QString const Worker::UPDATE_STEP_DONE   (   " [done]");
@@ -176,9 +177,14 @@ Worker::Worker(int customerNr,
   , m_filesToUpdate()
   , m_updateProcessRunning(true)
   , m_mainWindow(nullptr) /* contains plugin */
+  , m_dcDownloadFirmware(new Command("/opt/app/tools/atbupdate/ATBDownloadDCFirmware --read-dc-version true"))
   //, m_withoutIsmasDirectPort(true) /* useful for testing */ {
   , m_withoutIsmasDirectPort(false) /* useful for testing */ {
 
+
+    m_start = QDateTime::currentDateTime();
+    m_dcDownloadFirmware->setWorker(this);
+
     // TODO: turn object into singleton
     instance = this;
     m_lastFailedUpdateStep = UPDATE_STEP::NONE;
@@ -284,6 +290,8 @@ void Worker::privateUpdate() {
         return;
     }
 
+    return;
+
     QString func(__PRETTY_FUNCTION__);
 
     GUI() << (ISMAS() << (CONSOLE() << UPDATE_STEP::STARTED));
@@ -1257,6 +1265,7 @@ QString Worker::getPluginVersion(QString const &pluginFileName) const {
 
 QStringList Worker::getDCVersion() const {
     QStringList lst = (QStringList() << "N/A" << "N/A");
+#if 0
     Update const *up = update();
     if (up) {
         hwinf const *caPlugin = up->hw();
@@ -1278,6 +1287,7 @@ QStringList Worker::getDCVersion() const {
             }
         }
     }
+#endif
     return lst;
 }
 
@@ -1490,3 +1500,78 @@ PSAInstalled Worker::getPSAInstalled() {
 
     return psaInstalled;
 }
+
+bool Worker::dcUpdate() {
+    return m_dcDownloadFirmware->start("/opt/app/tools/atbupdate");
+}
+
+void Worker::summary() {
+
+    QString summary, first, second, line, tmp;
+    QVector<QPair<QString, QString>> vec = Utils::installedPackages();
+
+    int max_first = 0, max_second = 0;
+    for (int i = 0; i < vec.size(); ++i) {
+        max_first = std::max(max_first, vec[i].first.length());
+        max_second = std::max(max_second, vec[i].second.length());
+    }
+
+    max_first += 5;
+
+    summary = "UPDATE SUMMARY\n\n";
+
+    first = QString("%1").arg("start", max_first, QChar(' '));
+    tmp = QString("%1").arg(start().toString(Qt::ISODate));
+    second = QString("%1").arg(tmp, -max_second, QChar(' '));
+    line = first + ": " + second;
+    summary += line + "\n";
+
+    first = QString("%1").arg("update tool version", max_first, QChar(' '));
+    tmp = QString("%1 - %2 %3").arg(APP_VERSION).arg(APP_BUILD_DATE).arg(APP_BUILD_TIME);
+    second = QString("%1").arg(tmp, -max_second, QChar(' '));
+    line = first + ": " + second;
+    summary += line + "\n";
+
+    first = QString("%1").arg("machine number", max_first, QChar(' '));
+    tmp = QString("%1").arg(machineNr());
+    second = QString("%1").arg(tmp, -max_second, QChar(' '));
+    line = first + ": " + second;
+    summary += line + "\n";
+
+    first = QString("%1").arg("customer number", max_first, QChar(' '));
+    tmp = QString("%1").arg(customerNr());
+    second = QString("%1").arg(tmp, -max_second, QChar(' '));
+    line = first + ": " + second;
+    summary += line + "\n";
+
+    first = QString("%1").arg("zone number", max_first, QChar(' '));
+    tmp = QString("%1").arg(zoneNr());
+    second = QString("%1").arg(tmp, -max_second, QChar(' '));
+    line = first + ": " + second;
+    summary += line + "\n";
+
+    if (m_mainWindow) {
+        tmp = m_mainWindow->targetDcVersion();
+        if (!tmp.isEmpty()) {
+            first = QString("%1").arg("target device controller", max_first, QChar(' '));
+            second = QString("%1").arg(tmp, -max_second, QChar(' '));
+            line = first + ": " + second;
+            summary += line + "\n";
+        }
+    }
+
+    first = QString("%1").arg("apism", max_first, QChar(' '));
+    tmp = QString("%1").arg(apismVersion());
+    second = QString("%1").arg(tmp, -max_second, QChar(' '));
+    line = first + ": " + second;
+    summary += line + "\n";
+
+    for (int i = 0; i < vec.size(); ++i) {
+        first = QString("%1").arg(vec[i].first, max_first, QChar(' '));
+        second = QString("%1").arg(vec[i].second, -max_second, QChar(' '));
+        line = first + ": " + second;
+        summary += line + "\n";
+    }
+
+    emit showSummary(summary);
+}
diff --git a/UpdatePTUDevCtrl/worker.h b/UpdatePTUDevCtrl/worker.h
index d30984d..8c54d69 100644
--- a/UpdatePTUDevCtrl/worker.h
+++ b/UpdatePTUDevCtrl/worker.h
@@ -15,7 +15,6 @@
 #include <optional>
 #include <initializer_list>
 
-#include "update.h"
 #include "git/git_client.h"
 #include "ismas/ismas_client.h"
 #include "utils.h"
@@ -135,6 +134,8 @@
 #define ISMAS_UPDATE_REQUESTS                       (10)
 #define CHECK_UPDATE_TRIGGER_SET                    "Check update trigger ..."
 
+class Command;
+class Update;
 class MainWindow;
 class hwinf;
 class Worker : public QThread{
@@ -189,6 +190,7 @@ class Worker : public QThread{
     QStringList m_ismasTriggerStatusMessage;
 
     MainWindow *m_mainWindow;
+    Command *m_dcDownloadFirmware;
     bool m_withoutIsmasDirectPort;
     QString m_apismVersion;
 
@@ -458,8 +460,13 @@ public:
     Update *update() { return m_update; }
     Update const *update() const { return m_update; }
 
+    bool dcUpdate();
+    void summary();
+    QDateTime start() { return m_start; }
+
 signals:
     void appendText(QString, QString suffix = "");
+    void insertText(QString);
     void replaceLast(QString, QString);
     void replaceLast(QStringList, QString);
     void showErrorMessage(QString title, QString description);
@@ -470,6 +477,9 @@ signals:
     void restartExitTimer();
     void enableExit();
     void disableExit();
+    void showDcDownload(QString);
+    void showSummary(QString);
+    void setDcDownloadProgress(int);
 
 private slots:
     bool updateTriggerSet();
@@ -487,6 +497,8 @@ private:
     bool computeFilesToDownload();
     bool execOpkgCommands();
 
+    QDateTime m_start;
+
     static const QMap<UPDATE_STEP, const char*> smap;
 
     // CONSOLE()
diff --git a/common/include/System.h b/common/include/System.h
index 4c59a04..18c0a45 100644
--- a/common/include/System.h
+++ b/common/include/System.h
@@ -25,7 +25,9 @@ public:
     static bool umountSDCard();
 
     static std::optional<QString> checkForUSBStick(QString const &dirPathUnderMountPath = ".");
+    static std::optional<QString> checkForSDCard(QString const &dirPathUnderMountPath = ".");
     static QString getUSBMountPath(QString const &dirPathUnderMountPath = ".");
+    static QString getSDMountPath(QString const &dirPathUnderMountPath = ".");
 
     //static QString getUSBDeviceName();
     static bool umountUSBStick();
@@ -54,7 +56,8 @@ public:
     static QString getPTU4MACAddress();
 
     static QStringList getJsonFilesOnUsbStick(QString const &mountPath);
-
+    static QString getDCFileOnUsbStick(QString const &mountPath);
+    static QString getDCFileOnSDCard(QString const &mountPath);
 };
 
 #endif // SYSTEM_H
diff --git a/common/include/command.h b/common/include/command.h
new file mode 100644
index 0000000..33b155f
--- /dev/null
+++ b/common/include/command.h
@@ -0,0 +1,49 @@
+#ifndef COMMAND_H_INCLUDED
+#define COMMAND_H_INCLUDED
+
+#include <QObject>
+#include <QCoreApplication>
+#include <QString>
+#include <QStringList>
+#include <QProcess>
+#include <QScopedPointer>
+
+class Command : public QObject {
+    Q_OBJECT
+
+    QString m_command;
+    QString m_commandResult;
+
+    int m_waitForStartTimeout;
+    int m_waitForFinishTimeout;
+    bool m_verbose;
+    int m_exitCode;
+    QString m_workingDirectory;
+
+    QScopedPointer<QProcess> m_p;
+
+    QStringList m_args;
+
+public:
+    Command(QString command,
+            QStringList args,
+            QString workingDirectory,
+            bool verbose = true,
+            int start_timeout = 100000,
+            int finish_timeout = 100000);
+
+    void resetCommandResult() { m_commandResult.clear(); }
+    QString getCommandResult(bool reset = false);
+    QString const &command() const { return m_command; }
+    QString const &commandResult() const { return m_commandResult; }
+    QStringList const &args() const { return m_args; }
+
+    bool exec();
+    int exitCode() const { return m_exitCode; }
+
+private slots:
+    virtual void readyReadStandardOutput();
+    virtual void readyReadStandardError();
+};
+
+#endif // COMMAND_H_INCLUDED
diff --git a/common/include/utils_internal.h b/common/include/utils_internal.h
new file mode 100644
index 0000000..4cdb23a
--- /dev/null
+++ b/common/include/utils_internal.h
@@ -0,0 +1,92 @@
+#ifndef UTILS_INTERNAL_H_INCLUDED
+#define UTILS_INTERNAL_H_INCLUDED
+
+#include <QString>
+#include <QSettings>
+#include <memory>
+
+namespace internal {
+
+    static constexpr const char *UPDATE_NOT_NECESSARY{"not necessary"};
+    static constexpr const char *UPDATE_NOT_REQUESTED{"not requested"};
+    static constexpr const char *UPDATE_INITIAL{"initial update"};
+    static constexpr const char *UPDATE_REQUESTED{"requested"};
+
+    static constexpr const char *NO_CUSTOMER_REPOSITORY{"no customer repository"};
+    static constexpr const int NO_CUSTOMER_REPOSITORY_CODE{-8};
+    static constexpr const char *NO_ETC_CUSTOMER_REPOSITORY{"no etc/ in customer repository"};
+    static constexpr const int NO_ETC_CUSTOMER_REPOSITORY_CODE{-9};
+    static constexpr const char *NO_OPT_CUSTOMER_REPOSITORY{"no opt/ in customer repository"};
+    static constexpr const int NO_OPT_CUSTOMER_REPOSITORY_CODE{-10};
+
+    static constexpr const char *ISMAS_CONNECTED{"connected"};
+    static constexpr const char *ISMAS_DISCONNECTED{"disconnected"};
+    static constexpr const char *ISMAS_DISCONNECTING{"disconnecting"};
+    static constexpr const char *ISMAS_NOT_CONNECTED{"not connected"};
+    static constexpr const char *ISMAS_CONNECTION_IN_PROGRESS{"connecting"};
+
+    static constexpr const char *BROKER_CONNECTED{"connected"};
+     static constexpr const char *BROKER_DISCONNECTED{"disconnected"};
+     static constexpr const char *BROKER_DISCONNECTING{"disconnecting"};
+     static constexpr const char *BROKER_NOT_CONNECTED{"not connected"};
+     static constexpr const char *BROKER_CONNECTION_IN_PROGRESS{"connecting"};
+
+     static constexpr const int GIT_CHECKOUT_ERROR_CODE{-2};
+     static constexpr const int GIT_PULL_ERROR_CODE{-4};
+     static constexpr const int GIT_NOT_NECESSARY_CODE{1};
+     static constexpr const int GIT_UPDATED_CODE{2};
+     static constexpr const int GIT_CLONED_CODE{3};
+
+     static constexpr const char *GIT_CUSTOMER_REPO_CHECKOUT_ERROR{"checkout error"};
+     static constexpr const char *GIT_CUSTOMER_REPO_PULL_ERROR{"pull error"};
+     static constexpr const char *GIT_CUSTOMER_REPO_UP_TO_DATE{"up to date"};
+     static constexpr const char *GIT_CUSTOMER_REPO_NO_UPDATE_NECESSARY{"no repository update necessary"};
+     static constexpr const char *GIT_CUSTOMER_REPO_NOT_NECESSARY{"not necessary"};
+     static constexpr const char *GIT_CUSTOMER_REPO_UPDATED{"repository updated"};
+     static constexpr const char *GIT_CUSTOMER_REPO_CLONED{"repository cloned"};
+     static constexpr const char *GIT_UPDATED{"updated"};
+
+     static constexpr const char *EXEC_OPKG_COMMANDS_SUCCESS{"success"};
+     static constexpr const char *EXEC_OPKG_COMMANDS_FAIL{"FAIL"};
+     static constexpr const char *EXEC_OPKG_COMMANDS_NOACTION_SUCCESS{"success"};
+     static constexpr const char *EXEC_OPKG_COMMANDS_NOACTION_FAIL{"FAIL"};
+
+
+     static constexpr const char *UPDATE_DC_JSON_FILES_SUCCESS{"success"};
+
+     static constexpr const char *SYNC_CUSTOMER_REPO_FILES_SUCCESS{"success"};
+
+     static constexpr const char *UPDATE_DC_FIRMARE_SUCCESS{"success"};
+
+     static constexpr const char *OPKG_MARKER{"<OPKG>"};
+     static constexpr const char *SYNC_MARKER{"<SYNC>"};
+     static constexpr const char *DC_MARKER{"<DC>"};
+     static constexpr const char *GIT_MARKER{"<GIT>"};
+     static constexpr const char *ISMAS_MARKER{"<ISMAS>"};
+
+     static constexpr const int PERCENT_CHECK_ISMAS_CONNECIVITY{10};
+     static constexpr const int PERCENT_CHECK_UPDATE_REQUEST{20};
+     static constexpr const int PERCENT_CHECK_CUSTOMER_REPOSITORY{30};
+     static constexpr const int PERCENT_INSTALL_SW_PACKETS_NOACTION{40};
+     static constexpr const int PERCENT_INSTALL_SW_PACKETS{50};
+     static constexpr const int PERCENT_INSTALL_DC_CONFIGURATION{60};
+     static constexpr const int PERCENT_SYNCHRONIZE_REPO_AND_FILESYS{70};
+     static constexpr const int PERCENT_UPDATE_DC{80};
+     static constexpr const int PERCENT_SHOW_FINAL_STATUS{90};
+
+     static constexpr const char *DEFAULT_INI_DIR{"/etc/tools/atbupdate/"};
+     static constexpr const char *DEFAULT_INSTALL_DIR{"/opt/app/tools/atbupdate/"};
+
+     int read1stLineOfFile(QString fileName);
+     QString customerRepoRoot();
+     QString customerRepoDir();
+     QString customerRepoDcDir();
+     QString customerRepoDirName();
+     QString repositoryUrl();
+     QString branchName();
+     bool customerRepoExists();
+     std::unique_ptr<QSettings> readSettings(QString const &optionalDirName = "");
+     std::unique_ptr<QString> dcCandidateToInstall(QString const &dcDirectory);
+ }
+
+ #endif // UTILS_INTERNAL_H_INCLUDED
diff --git a/common/src/System.cpp b/common/src/System.cpp
index 72358e2..2af9af8 100644
--- a/common/src/System.cpp
+++ b/common/src/System.cpp
@@ -265,6 +265,20 @@ std::optional<QString> System::checkForUSBStick(QString const &dirPathUnderMount
     return mountPath.isEmpty() ? std::nullopt : std::optional<QString>(mountPath);
 }
 
+std::optional<QString> System::checkForSDCard(QString const &dirPathUnderMountPath) {
+#if defined (ARCH_DesktopLinux)
+    // DEBUG / TEST:
+    if (QFileInfo(getSDMountPath()).isDir())
+        return true;
+    else
+        return false;
+#endif
+
+    QString const &mountPath = getSDMountPath(dirPathUnderMountPath);
+    // qCritical() << "MOUNT-PATH" << mountPath;
+    return mountPath.isEmpty() ? std::nullopt : std::optional<QString>(mountPath);
+}
+
 
 
 /**
@@ -315,7 +329,7 @@ QString System::getUSBMountPath(QString const &dirPathUnderMountPath) {
 
                 mountLine = line.split(' ');
                 if (mountLine.size() > 3) {
-                    qCritical() << "System::getUSBMountPath(): " << mountLine.at(0) << " is mounted on " << mountLine.at(2);
+                    // qCritical() << "System::getUSBMountPath(): " << mountLine.at(0) << " is mounted on " << mountLine.at(2);
                     QDir d(QDir::cleanPath(mountLine.at(2) + QDir::separator() + dirPathUnderMountPath));
                     if (d.exists()) {
                         return mountLine.at(2);
@@ -332,6 +346,64 @@ QString System::getUSBMountPath(QString const &dirPathUnderMountPath) {
     return "";
 }
 
+QString System::getSDMountPath(QString const &dirPathUnderMountPath) {
+
+#if defined (ARCH_DesktopLinux)
+    // DEBUG / TEST:
+    return QDir::homePath().append("/APconfigTest/USB");
+#endif
+
+    QProcess process;
+    process.setProcessChannelMode(QProcess::MergedChannels);
+
+    QStringList mountLine;
+
+    qDebug() << "System::getSDMountPath()";
+
+    QRegExp devRegExp   = QRegExp("dev/mmc*",   Qt::CaseSensitive, QRegExp::WildcardUnix);
+    QRegExp mountRegExp = QRegExp("media/mmc*", Qt::CaseSensitive, QRegExp::WildcardUnix);
+
+    QString commandString = "mount";
+
+    process.start(commandString);
+    if (!process.waitForStarted()) {
+        errorMsg = "System::getSDMountPath(): ERROR: waitForStarted()";
+        return "";
+    }
+    if (!process.waitForFinished(600000)) {
+        errorMsg = "System::getSDMountPath(): ERROR: " + process.errorString();
+        qDebug() << errorMsg;
+        return "";
+    }
+    else {
+        QByteArray bytes = process.readAll();
+        QStringList lines = QString(bytes).split("\n");
+        foreach (QString line, lines) {
+            qDebug() << "System::getSDMountPath() line:    " << line;
+
+            if (line.contains(devRegExp) && line.contains(mountRegExp)) {
+
+                qDebug() << "  -> this line is a usb storage device mount" << line;
+
+                mountLine = line.split(' ');
+                if (mountLine.size() > 3) {
+                    // qCritical() << "System::getSDMountPath(): " << mountLine.at(0) << " is mounted on " << mountLine.at(2);
+                    QDir d(QDir::cleanPath(mountLine.at(2) + QDir::separator() + dirPathUnderMountPath));
+                    if (d.exists()) {
+                        return mountLine.at(2);
+                    } else {
+                        qCritical() << "directory" << d.absolutePath() << "does not exist";
+                    }
+                }
+            }
+        }
+    }
+
+    qDebug() << "System::getSDMountPath() no mounted usb device found!";
+
+    return "";
+}
+
 QStringList System::getJsonFilesOnUsbStick(QString const &mountPath) {
     QStringList jsonFiles;
 
@@ -354,6 +426,38 @@ QStringList System::getJsonFilesOnUsbStick(QString const &mountPath) {
     return jsonFiles;
 }
 
+QString System::getDCFileOnUsbStick(QString const &mountPath) {
+    QString dcFile;
+
+    // /media/sda2/etc/dc
+    QString const &dirPath = QDir::cleanPath(mountPath + QDir::separator() + "etc" + QDir::separator() + "dc");
+    QDir d(dirPath);
+    if (d.exists()) {
+        QFileInfo fi(dirPath + QDir::separator() + "dc2c.bin");
+        if (fi.exists()) {
+            dcFile = fi.absoluteFilePath();
+        }
+    }
+
+    return dcFile;
+}
+
+QString System::getDCFileOnSDCard(QString const &mountPath) {
+    QString dcFile;
+
+    // /media/sda2/etc/dc
+    QString const &dirPath = QDir::cleanPath(mountPath + QDir::separator() + "etc" + QDir::separator() + "dc");
+    QDir d(dirPath);
+    if (d.exists()) {
+        QFileInfo fi(dirPath + QDir::separator() + "dc2c.bin");
+        if (fi.exists()) {
+            dcFile = fi.absoluteFilePath();
+        }
+    }
+
+    return dcFile;
+}
+
 /********************************************************************************
  * static function to check if a mounted sd-card is writable.
  *
diff --git a/common/src/command.cpp b/common/src/command.cpp
new file mode 100644
index 0000000..28b8c19
--- /dev/null
+++ b/common/src/command.cpp
@@ -0,0 +1,128 @@
+#include "command.h"
+
+#include <QProcess>
+#include <QDebug>
+#include <QDir>
+#include <QRegularExpression>
+#include <QDateTime>
+
+Command::Command(QString command, QStringList args, QString workingDirectory,
+                 bool verbose, int start_timeout, int finish_timeout)
+    : m_command(command.trimmed())
+    , m_commandResult("")
+    , m_waitForStartTimeout(start_timeout)
+    , m_waitForFinishTimeout(finish_timeout)
+    , m_verbose(verbose)
+    , m_exitCode(-1)
+    , m_workingDirectory(workingDirectory)
+    , m_args(args) {
+    m_p.reset(new QProcess(this));
+    if (m_p) {
+        m_p->setWorkingDirectory(workingDirectory);
+        m_p->setProcessChannelMode(QProcess::MergedChannels);
+
+        connect(m_p.get(), SIGNAL(readyReadStandardOutput()), this, SLOT(readyReadStandardOutput()));
+        connect(m_p.get(), SIGNAL(readyReadStandardError()), this, SLOT(readyReadStandardError()));
+    }
+}
+
+void Command::readyReadStandardOutput() {
+    QProcess *p = (QProcess *)sender();
+    if (p) {
+        QString s = p->readAllStandardOutput();
+        if (m_verbose) {
+//            qCritical().noquote() << s;
+            m_commandResult += s;
+        }
+    }
+}
+
+void Command::readyReadStandardError() {
+    QProcess *p = (QProcess *)sender();
+    if (p) {
+        QString s = p->readAllStandardError();
+//        qCritical().noquote() << s;
+        m_commandResult += s;
+    }
+}
+
+
+QString Command::getCommandResult(bool reset) {
+    if (reset == false) {
+        return m_commandResult;
+    }
+
+    QString commandResult = m_commandResult;
+    m_commandResult.clear();
+
+    return commandResult;
+}
+
+bool Command::exec() {
+
+    if (!m_args.isEmpty()) {
+        m_p->start(m_command, m_args);
+    } else {
+        m_p->start(m_command);
+    }
+
+    qint64 const start = QDateTime::currentDateTime().toMSecsSinceEpoch();
+
+    bool started = false;
+    if ((started = m_p->waitForStarted(m_waitForStartTimeout)) == true) {
+        // qCritical() << "PROCESS" << m_command << "STARTED IN" << m_p->workingDirectory();
+        if (m_p->state() == QProcess::ProcessState::Running) {
+            // qDebug() << "PROCESS" << m_command << "RUNNING IN" << p->workingDirectory();
+            // wait forever for git/opkg-commands to finish
+            int wait = m_waitForFinishTimeout;
+            if (m_command.trimmed().startsWith("git", Qt::CaseInsensitive) ||
+                m_command.trimmed().startsWith("opkg", Qt::CaseInsensitive)) {
+                wait = -1;
+            }
+            bool const no_timeout = m_p->waitForFinished(wait);
+            if (no_timeout) {
+                // qDebug() << "PROCESS" << m_command << "FINISHED IN" << p->workingDirectory();
+                if (m_p->exitStatus() == QProcess::NormalExit) {
+                    if ((m_exitCode = m_p->exitCode()) == 0) {
+                        qCritical().noquote() << m_p->readAllStandardOutput();
+                        //qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
+                        //qDebug() << "EXECUTED" << m_command
+                        //         << QString("(runtime %1ms)").arg(end-start)
+                        //         << "with code" << m_exitCode
+                        //         << "IN" << m_p->workingDirectory();
+                        return true;
+                    } else {
+                        qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
+                        qCritical() << "EXECUTED" << m_command
+                                    << QString("(runtime %1ms)").arg(end-start)
+                                    << "with code" << m_exitCode
+                                    << "IN" << m_p->workingDirectory();
+                    }
+                } else {
+                    qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
+                    qCritical() << "PROCESS" << m_command << "CRASHED with code"
+                                << m_p->exitCode()
+                                << QString("(after %1ms)").arg(end-start)
+                                << "IN" << m_p->workingDirectory();
+                }
+            } else {
+                qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
+                qCritical() << "PROCESS" << m_command
+                            << "DID NOT FINISH WITH" << wait
+                            << "MS IN" << m_p->workingDirectory()
+                            << QString("(runtime %1ms)").arg(end-start);
+            }
+        } else {
+            qCritical() << "WRONG PROCESS STATE" << m_p->state()
+                        << "IN" << m_p->workingDirectory();
+        }
+    } else {
+        qint64 const end = QDateTime::currentDateTime().toMSecsSinceEpoch();
+        qCritical() << "PROCESS" << m_command << "TIMEOUT AT START"
+                    << QString("(runtime %1ms)").arg(end-start)
+                    << "IN" << m_p->workingDirectory() << m_waitForStartTimeout;
+    }
+
+    return false;
+}
+
diff --git a/common/src/utils_internal.cpp b/common/src/utils_internal.cpp
new file mode 100644
index 0000000..365c6ee
--- /dev/null
+++ b/common/src/utils_internal.cpp
@@ -0,0 +1,167 @@
+#include "utils_internal.h"
+
+#include <QFile>
+#include <QDir>
+#include <QTextStream>
+#include <QSettings>
+#include <QDebug>
+#include <QCryptographicHash>
+#include <QFileInfoList>
+
+namespace internal {
+
+int read1stLineOfFile(QString fileName) {
+    QFile f(fileName);
+    if (f.exists()) {
+        if (f.open(QIODevice::ReadOnly | QIODevice::Text)) {
+            QTextStream in(&f);
+            in.setCodec("UTF-8");
+            while(!in.atEnd()) {
+                return in.readLine().toInt();
+            }
+        }
+    }
+    return -1;
+}
+
+QString customerRepoRoot() {
+    return "/opt/app/tools/atbupdate/";
+}
+
+QString customerRepoDirName() {
+    int const customerNr = read1stLineOfFile("/mnt/system_data/cust_nr");
+    return (customerNr != -1) ? QString("customer_%1").arg(customerNr) : "";
+}
+
+QString customerRepoDir() {
+    QString const &n = customerRepoDirName();
+    QString const &r = customerRepoRoot();
+    return !n.isEmpty() ? QDir::cleanPath(r + QDir::separator() + n) : "";
+}
+
+QString customerRepoDcDir() {
+    QString const &r = customerRepoDir();
+    return QDir::cleanPath(r + QDir::separator() + "etc/dc/");
+}
+
+bool customerRepoExists() {
+    QString const repoDir{customerRepoDir()};
+    return !repoDir.isEmpty() ? QDir(repoDir).exists() : false;
+}
+
+QString repositoryUrl() {
+    return "gitea@ptu-config.atb-comm.de:ATB/";
+}
+
+QString branchName() {
+    int const zoneNr = read1stLineOfFile("/mnt/system_data/zone_nr");
+    if (zoneNr != -1) {
+        return QString("zg1/zone%1").arg(zoneNr);
+    }
+    return "";
+}
+
+std::unique_ptr<QSettings> readSettings(QString const &optionalDirName) {
+    std::unique_ptr<QSettings> settings{std::make_unique<QSettings>()};
+
+    //QString const fileName{settings->applicationName() + ".ini"};
+    QString const fileName{"ATBUpdateTool.ini"};
+    QDir d;
+
+    if (!optionalDirName.isEmpty()) {
+        d = QDir{optionalDirName};
+        if (d.exists()) { // try to find ini-file under optionalDirname
+            QFileInfo fi{d, optionalDirName};
+            if (fi.exists()) {
+                settings.reset(new QSettings(fi.absoluteFilePath(), QSettings::IniFormat));
+                return settings;
+            } else {
+                qCritical() << fi.absoluteFilePath() << "not found."
+                            << "Try" << internal::DEFAULT_INI_DIR;
+            }
+        } else {
+            qCritical() << optionalDirName << "not found."
+                        << "Try" << internal::DEFAULT_INSTALL_DIR;
+        }
+    }
+    d = internal::DEFAULT_INI_DIR;
+    if (d.exists()) { // try to find ini-file under /etc/tools/atbupdate
+        QFileInfo fi{d, fileName};
+        if (fi.exists()) {
+            settings.reset(new QSettings(fi.absoluteFilePath(), QSettings::IniFormat));
+            return settings;
+        } else {
+            qCritical() << fi.absoluteFilePath() << "not found."
+                        << "Try" << internal::DEFAULT_INSTALL_DIR;
+        }
+    } else {
+        qCritical() << internal::DEFAULT_INI_DIR << "not found."
+                    << "Try" << internal::DEFAULT_INSTALL_DIR;
+    }
+    d = QDir{internal::DEFAULT_INSTALL_DIR};
+    if (d.exists()) { // try to find ini-file under /opt/app/tools/atbupdate
+        QFileInfo fi{d, fileName};
+        if (fi.exists()) {
+            settings.reset(new QSettings(fi.absoluteFilePath(), QSettings::IniFormat));
+            return settings;
+        } else {
+            qCritical() << fi.absoluteFilePath() << "not found.";
+        }
+    } else {
+        qCritical() << internal::DEFAULT_INSTALL_DIR << "not found.";
+    }
+
+    return settings;
+}
+
+std::unique_ptr<QString> dcCandidateToInstall(QString const &dcDirectory) {
+    std::unique_ptr<QString> dcCandidate{nullptr};
+
+    qCritical() << __func__ << __LINE__ << dcDirectory;
+
+    QDir dcDir{dcDirectory.isEmpty() ? customerRepoDcDir() : dcDirectory};
+    if (dcDir.exists()) {
+
+        QFileInfoList fileInfoList =
+            dcDir.entryInfoList(QStringList("*.bin"),
+                                QDir::Files | QDir::NoDotAndDotDot | QDir::NoSymLinks);
+
+        QFileInfo dc2cbin{dcDir.absoluteFilePath("dc2c.bin")};
+
+
+        if (dc2cbin.exists()) {
+
+            QCryptographicHash md5gen(QCryptographicHash::Md5);
+            QByteArray ba_dc2cbin{};
+            {
+                QFile f{dc2cbin.absoluteFilePath()};
+                if (f.open(QIODevice::ReadOnly)) {
+                    md5gen.addData(f.readAll());
+                    ba_dc2cbin = md5gen.result();
+                    md5gen.reset();
+                }
+            }
+
+            if (ba_dc2cbin.size() > 0) {
+                QFileInfoList::const_iterator it;
+                for (it = fileInfoList.cbegin(); it != fileInfoList.cend(); ++it) {
+                    if (it->absoluteFilePath() != dc2cbin.absoluteFilePath()) {
+                        QFile f{it->absoluteFilePath()};
+                        if (f.open(QIODevice::ReadOnly)) {
+                            md5gen.addData(f.readAll());
+                            if (ba_dc2cbin == md5gen.result()) {
+                                dcCandidate.reset(new QString(f.fileName()));
+                                break;
+                            }
+                            md5gen.reset();
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    return dcCandidate;
+}
+
+} // namespace internal