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Discussion Starter · #1 ·
tech2 nor our software modifies the ECM serial # during a reflash.

if you write entire with a file with operating system that is not compatible with the existing operating system, it can corrupt the serial # and other things including making the PCM unreadable/writeable.
tech 2 flash
Generally this happens if you write a much newer or much older OS to the ECM.

 
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