Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -ra4f9ac570f88e76b70d2f818cd8f9157e4a83a74 -r239f565516c73aae797288effcfdf1fca0a361a0
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision a4f9ac570f88e76b70d2f818cd8f9157e4a83a74)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 239f565516c73aae797288effcfdf1fca0a361a0)
@@ -892,7 +892,8 @@
     }
 
     // handle any test messages if tester has logged in successfully
-    if ( ( msgID > MSG_ID_FIRST_DG_TESTER_MESSAGE ) && ( msgID <= END_OF_MSG_IDS ) && ( TRUE == isTestingActivated() ) )
+    // NOTE: END_OF_MSG_IDS = 65536 which is out of the range of a U16 so it is subtracted by 1. This is unreachable in development testing
+    if ( ( msgID > MSG_ID_FIRST_DG_TESTER_MESSAGE ) && ( msgID <= END_OF_MSG_IDS - 1 ) && ( TRUE == isTestingActivated() ) )
     {
         switch ( msgID )
         {