Needing some help!!!!!!! I have a Sct x4 tuner and was just trying to change my 2007 GT over to run off of 91 octane and somehow locked up the controller and now it thinks it’s a GT500 and has locked up the PCM/ECM. I have taken it to a dealer in hopes that they could just flash it back to factory but that’s not the case they want to charge me $1000 to replace the ECM does anybody know how to get it unlocked or a way to flash it back to factory.

Thanks