diff --git a/DownloadDCFirmware/main.cpp b/DownloadDCFirmware/main.cpp
index 0c1267a..ad64256 100644
--- a/DownloadDCFirmware/main.cpp
+++ b/DownloadDCFirmware/main.cpp
@@ -189,7 +189,7 @@ int main(int argc, char **argv) {
     }
 
     Update u(fi.absoluteFilePath(), libca, debug, noaction);
-    u.run();
+    // u.run();
 
     qInfo() << "<DC-UPDATE-FINISH>";
 
diff --git a/DownloadDCFirmware/update.cpp b/DownloadDCFirmware/update.cpp
index 52ac204..166c785 100644
--- a/DownloadDCFirmware/update.cpp
+++ b/DownloadDCFirmware/update.cpp
@@ -130,16 +130,11 @@ Update::sendNextAddress(int bNum) const {
     if ( bNum==0 || bNum==1024 || bNum==2048 || bNum==3072 || bNum==4096 ) {
         // qDebug() << "addr-block" << bNum << "...";
         while (noAnswerCount <= 250) {
-            // TODO
-            // m_hw->bl_sendAddress(bNum);
+            m_hw->bl_sendAddress(bNum);
 
             QThread::msleep(100);
 
-            // TODO
-            // DownloadResult const res = sendStatus(m_hw->bl_wasSendingAddOK());
-
-            DownloadResult const res = DownloadResult::OK;
-
+            DownloadResult const res = sendStatus(m_hw->bl_wasSendingAddOK());
             if (res != DownloadResult::NOP) {
                 if (res == DownloadResult::ERROR) {
                     if (++errorCount >= 10) {
@@ -179,20 +174,14 @@ Update::sendNextDataBlock(QByteArray const &binary, int bNum) const {
     qInfo() << s.toUtf8().constData();
 
     QThread::msleep(200);
-    return DownloadResult::OK;
 
-    // QByteArray b((const char *)(&local[0]), 64);
-    // qCritical() << "SNDB" << bNum << b.size() << b.toHex();
+    QByteArray b((const char *)(&local[0]), 64);
+    qCritical() << "SNDB" << bNum << b.size() << b.toHex();
 
     while (noAnswerCount <= 250) {
-        // TODO
-        // m_hw->bl_sendDataBlock(64, local);
-
-        // TODO
-        // DownloadResult const res = sendStatus(m_hw->bl_wasSendingDataOK());
-
-        DownloadResult const res = DownloadResult::OK;
+        m_hw->bl_sendDataBlock(64, local);
 
+        DownloadResult const res = sendStatus(m_hw->bl_wasSendingDataOK());
         if (res != DownloadResult::NOP) {
             if (res == DownloadResult::ERROR) {
                 if (++errorCount >= 10) {
@@ -213,12 +202,13 @@ Update::sendNextDataBlock(QByteArray const &binary, int bNum) const {
 }
 
 bool Update::startBootloader() const {
+#if 0
     qInfo() << nextTimePoint().toUtf8().constData() << "start boot loader";
     QThread::msleep(1000);
     qInfo() << nextTimePoint().toUtf8().constData() << "start boot loader ...done";
     return true;
+#else
 
-#if 0
     int nTry = 5;
     while (--nTry >= 0) {
         m_hw->bl_startBL();
@@ -234,16 +224,19 @@ bool Update::startBootloader() const {
     }
     qCritical() << "starting bootloader...FAILED";
     return false;
+
 #endif
 }
 
 bool Update::stopBootloader() const {
+#if 0
     qInfo() << nextTimePoint().toUtf8().constData() << "stopping bootloader";
     QThread::msleep(1000);
     qInfo() << nextTimePoint().toUtf8().constData() << "stopping bootloader ...done";
     return true;
 
-#if 0
+#else
+
     qDebug() << "stopping bootloader...";
     int nTry = 5;
     while (--nTry >= 0) {
@@ -256,13 +249,13 @@ bool Update::stopBootloader() const {
     }
     qCritical() << "stopping bootloader...FAILED";
     return false;
+
 #endif
 }
 
 bool Update::resetDeviceController() const {
     qInfo() << nextTimePoint().toUtf8().constData() << "resetting device controller";
-    // TODO
-    // m_hw->bl_rebootDC();
+    m_hw->bl_rebootDC();
 
     // wait maximally 3 seconds, before starting bootloader
     QThread::sleep(1);
@@ -280,12 +273,12 @@ QByteArray Update::loadBinaryDCFile(QString const &filename) const {
     if (!file.exists()) {
         qCritical() << "(" << __func__ << ":" << __LINE__ << ")"
                     << file.fileName() << "does not exist";
-        return QByteArray();
+        return QByteArray{};
     }
     if (!file.open(QIODevice::ReadOnly)) {
         qCritical() << "(" << __func__ << ":" << __LINE__ << ")"
                     << "cannot open file" << file.fileName();
-        return QByteArray();
+        return QByteArray{};
     }
 
     qInfo() << nextTimePoint().toUtf8().constData()
@@ -392,10 +385,8 @@ int Update::run() {
 
     qInfo() << "DC auto request OFF";
 
-    // dennis einzelne linie
     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;
@@ -415,8 +406,6 @@ int Update::run() {
             while (res != DownloadResult::ERROR && currentBlock < m_totalBlocks) {
                 if ((res = sendNextAddress(currentBlock)) != DownloadResult::ERROR) {
                     if ((res = sendNextDataBlock(ba, currentBlock)) != DownloadResult::ERROR) {
-                        // TODO
-                        // m_hw->dcDownloadSetCurrentBlockNumber(currentBlock);
                         currentBlock += 1;
                     } else break;
                 }