Ok this is a strange one. Factory 2002 Holden Monaro LS1 PCM. Other tuner was having issue writing it with EFI Live and found out that it has Custom OS on it. So he called and asked if I could flash a stock OS back onto it so they could tune it on the dyno, because they use EFI sadly. Ok, no big deal. Read the original custom OS file no problem, licensed and wrote a stock 2002 Monaro file to the PCM with correct VIN. Now when trying to read that file I get: Controller Unlocker X36 exceeded number of attempts. Which Ive seen before with a locked PCM obviously, butttt this one isnt locked. Now I can no longer read or write to this PCM.