Index: sources/update/VSwUpdate.cpp
===================================================================
diff -u -r20b370a54d2737831b307a0de82aec9e06e2b772 -r054cc58969b2aacd15b12ff798887b73d339a302
--- sources/update/VSwUpdate.cpp	(.../VSwUpdate.cpp)	(revision 20b370a54d2737831b307a0de82aec9e06e2b772)
+++ sources/update/VSwUpdate.cpp	(.../VSwUpdate.cpp)	(revision 054cc58969b2aacd15b12ff798887b73d339a302)
@@ -29,8 +29,8 @@
 #include <QProcess>
 #include <QThread>
 #include <QProcessEnvironment>
+#include "crc.h"
 
-
 // Enables (1) or disables (!1) reboot to allow for better testing.
 // Default is to reboot when this is finished.
 #ifndef REBOOT_ENABLED
@@ -426,30 +426,33 @@
  * \param   isHD    It is for HD not DG.
  */
 void VSWUpdate::sendAppCommand(uint16 cmd, bool isHD) {
-    uint8 msg[8];
 
-    // Zero it.
-    memset(msg, 0, 8);
+    QByteArray msg;
+    msg.append(ePayload_Sync);  // 0xA5
 
-    // Sync byte.
-    msg[0] = 0xA5;
-
     // 2 bytes sequence #.
     uint16_t seqNo = _MessageDispatcher.getSequenceNumber();
+    msg.append((uint8)(seqNo >> 8));
+    msg.append((uint8)(seqNo & 0xFF));
 
-    msg[1] = (uint8)(seqNo >> 8);
-    msg[2] = (uint8)(seqNo & 0xFF);
-
     // 2 byte msgID.
-    msg[2] = (uint8)((cmd >> 8) & 0xFF);
-    msg[3] = (uint8)(cmd & 0xFF);
+    msg.append((uint8)((cmd >> 8) & 0xFF));
+    msg.append((uint8)(cmd & 0xFF));
 
-    // 1 byte payload length, msg[4] = 0, already done.
+    // 1 byte payload size = 0.
+    msg.append((uint8)0);
 
+    // 1 byte app protocol CRC.
+    msg.append(crc8(msg.mid(1)));
+
+    // Pad 2 bytes zero.
+    msg.append((uint8)0);
+    msg.append((uint8)0);
+
     // Send it.
     // eChlid_UI_HD    = 0x100, ///< UI => HD [Out]
     // eChlid_UI_DG    = 0x110, ///< UI => DG [Out]
-    _CanInterface.sendSWUpdateMsg(isHD ? eChlid_UI_HD : eChlid_UI_DG, msg, 8);
+    _CanInterface.sendSWUpdateMsg(isHD ? eChlid_UI_HD : eChlid_UI_DG, (uint8_t *)msg.data(), 8);
 }
 
 /*!