^^^ The ecu you tried above is an EDC17CP02 that uses the TC1766 Tricore. This uses OTP area for ISN. No tool in the world can change ISN on that ecu. The ECU James is battling with is EDC17CP09 (I suspect) that uses TC1796, on this ecu it is possible to change ISN. So we need to figure out why Autohex is battling with that. I don't have one on hand to test, when I get one I can check a little what's up.