Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -rfc9a9244cf4288ff0623c3e02455ac565bf60cdd -r09e6320e3f3c3c973de0b66e5799d710db8cc427
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision fc9a9244cf4288ff0623c3e02455ac565bf60cdd)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 09e6320e3f3c3c973de0b66e5799d710db8cc427)
@@ -56,7 +56,7 @@
     }
     else
     {
-        if ( RECEIVE_MSG_ID[ BL_STACK_ID ] == mailBox )
+        if ( RECEIVE_MSG_ID[ BL_STACK_ID ][ FW_STACKS_RCV_MAIL_BOX_INDEX ] == mailBox )
         {
             if ( FALSE != canIsRxMessageArrived( canREG1, mailBox ) )
             {
@@ -82,9 +82,10 @@
  *************************************************************************/
 BOOL sendAckNackStatusFromFirmware( U08* data )
 {
-    BOOL status = FALSE;
+    BOOL status     = FALSE;
+    U32 respMailBox = RECEIVE_MSG_ID[ BL_STACK_ID ][ FW_STACKS_RESP_MAIL_BOX_INDEX ];
 
-    if ( 0 != canTransmit( canREG1, (U32)SW_UPDATE_TD_RESP, data ) )
+    if ( 0 != canTransmit( canREG1, respMailBox, data ) )
     {
         status = TRUE;
     }