I came close to bricking my wife's 2007 Hummer H3 3.7L tonight! I could read it without any issues. When I went to reflash it failed... it erased the PCM memory and just when it said it was starting to reflash it failed. I could not get any contact with the PCM after that so I tought I was f***ed. Luckily I was able to reprogram it with GM SPS using a Mongoose cable so the truck is now up and runnig again

Does anyone know exactly what I need to do to avoid having that experience again? Any specific fuses that need to be pulled or should I just rip out the PCM and bench flash it instead?

/Stefan