diff --git a/update.cpp b/update.cpp
index 8fc6f34..8de63c5 100644
--- a/update.cpp
+++ b/update.cpp
@@ -610,9 +610,12 @@ bool Update::downloadJson(enum FileTypeJson type,
                           int templateIdx,
                           QString jsFileToSendToDC) const {
 
-    qDebug() << "updating json-file:" << jsFileToSendToDC << "...";
-    qDebug() << "    template-index:" << templateIdx;
-    qDebug() << "         json-type:" << jsonType(type);
+
+    Utils::printInfoMsg(
+        QString("UPDATING JSON-FILE=%1, TEMPLATE-INDEX=%2, JSON-TYPE=%3")
+            .arg(jsFileToSendToDC)
+            .arg(templateIdx)
+            .arg(jsonType(type)));
 
     m_hw->dc_autoRequest(true); // downloading Json needs the AutoEmission flag
     qDebug() << "SET AUTO-REQUEST=TRUE";
@@ -623,7 +626,7 @@ bool Update::downloadJson(enum FileTypeJson type,
     while ((ready = m_hw->sys_ready4sending()) == false) {
         QThread::msleep(200);
         if (--nTry <= 0) {
-            qCritical() << "SYS NOT READY FOR SENDING AFTER 5 SECONDS";
+            Utils::printCriticalErrorMsg("SYS NOT READY FOR SENDING AFTER 5 SECONDS");
             break;
         }
     }
@@ -636,22 +639,27 @@ bool Update::downloadJson(enum FileTypeJson type,
             if (file.open(QIODevice::ReadOnly)) {
                 if (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())) {
                         QThread::sleep(1);
-                        qDebug() << "SENT" << jsFileToSendToDC;
                         ret = true;
                     }
                 } else {
-                    qCritical() << "SIZE OF" << jsFileToSendToDC
-                                << "TOO BIG (" << fi.size() << "BYTES)";
+                    Utils::printCriticalErrorMsg(
+                        QString("SIZE OF %1 TOO BIG (%2 BYTES)")
+                            .arg(jsFileToSendToDC).arg(fi.size()));
                 }
             } else {
-                qCritical() << "CANNOT OPEN" << jsFileToSendToDC << "FOR READING";
+                Utils::printCriticalErrorMsg(
+                    QString("CAN NOT OPEN ") + jsFileToSendToDC + " FOR READING");
             }
         } else {
-            qCritical() << jsFileToSendToDC << "DOES NOT EXIST";
+            Utils::printCriticalErrorMsg(
+                QString(jsFileToSendToDC) + " DOES NOT EXIST");
         }
     }
 
@@ -871,7 +879,7 @@ bool Update::doUpdate(int &displayIndex, QStringList const &filesToWorkOn) {
             res = true;
 #if UPDATE_CASH_TEMPLATE == 1
             if ((res = updateCashConf(fToWorkOn))) {
-                qInfo() << "downloaded cash template"<< fToWorkOn;
+                Utils::printInfoMsg(QString("DOWNLOADED CASH TEMPLATE %1").arg(fToWorkOn));
                 ++displayIndex;
                 emit m_worker->appendText(QString("\n(") + QString("%1").arg(displayIndex).rightJustified(2, ' ') + QString(")")
                       + QString(" Update ") + QFileInfo(fToWorkOn).fileName(),