I've only had 94-95 LT1 PCM's brick during flash.
Perhaps 94-95 LT1 software (Flashhack) from EEHack website will help? https://fbodytech.com/flashhack/
For the few instances that the LT1 PCM bricked during flash, I sent the bricked PCM to TunerCats ( http://www.tunercat.com/ ) to have the flash chip replaced.
dave w
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