I have a 2010 Camaro LS3 here that is tuner locked.
I purchased a pcm from a company giving them the serv # and all.
Pcm arrived with the correct tune but wrong VIN so i changed the Vin

Vehicle won't crank with this PCM but will with the original.

I have HPT and EFI Live i tried using both to set the VATS with no luck.
security light is off but it still won't crank.

I'm told you can't use a used pcm in these vehicles?

Is there anything i can do or does someone have full instructions on how to set it up?
or am i just stuck buying a new pcm from the dealer?