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What does a complete write do with hp tuners?you could just try flashing a stock file from another GTO that's the same year model, with the same OS and calibration service numbers. then do a file compare, and copypasta your calibration.
but hptuners doesn't write the entire ECM, i don't think. with the tech ii or vxnano you're doing a complete over write. so, if the problem is a corruption is in a spot hptuner's can't touch... well...