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On a stock truck this should not be necessary, it's when aftermarket audio devices are added that connect to the data bus when things turn bad.
During development we tested reading / writing on a dead stock LLY without any fuses needing to be pulled.
Cheers,
Ross
Oh, I see, the aftermarket radio is the offender.
my truck is all stock radio and no accessories on or plugged in and the first 10 times i tried to tune it was rejecting it due to the bootloader deal. I unplugged everything, shut the key off and gave it a few minutes, tried it again and it worked like a champ and has been working great ever since. Just a little fyi for those of you freaking out right now like i was reading thru all these threads.