Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -rd756f33d33c00c6ed3adddb1a31a2bd03ac1327a -r02654dc5b372b3af948ebd28aabb95cc4b51c785
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision d756f33d33c00c6ed3adddb1a31a2bd03ac1327a)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 02654dc5b372b3af948ebd28aabb95cc4b51c785)
@@ -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 )
         {