Originally Posted by
GMPX
Without the anti-tuning patch applied all that will happen is at the END of the flash the ECM will throw an error saying the tune has not been accepted. Once the patch is done once it is done for good, it doesn't undo itself.
The transfer suspended unfortunately is a bit of a generic error the ECM sends back, it could come from some other aftermarket module on the CAN bus interrupting the reflash process constantly, or as we've seen a couple of times people trying to flash the wrong sort of ECM file in (eg, flashing a 6.7L tune in to a 5.9).
I would attempt to flash the trucks stock tune back in (or one you know worked ok), if that works but the modified tune keeps failing then there might be an issue with that tune.