Installed DSP5 switch, then flashed the ECU. now truck wont starts, EFI live says "ECU not detected".
It was detecting it after the switch install, so I don't think that was the problem.
I check fuses but couldn't find any bad ones and I can get power from the OBD port.
if i try to display info VIN/OS for GPM I get VIN: Unknown opSys:12597107
if i display for TCM i get the correct VIN.
What should I try next?