Can a Bluetooth ELM327 adapter be used to flash a VIN?
It's claimed here that
The vin number is about the only thing in the PCM that's not a protected value.
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My understanding is ... yes, you can. Don't go away so fast though ... there are caveats:
The guy in this video briefly talks about using an ELM327. He uses other equipment to do it. You can see what he has to do to get the VIN changed on the GM PCM.