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I just dug out my MPVI today to do some work. If I'm not mistaken the files are also .hpt I would expect them to work on either v1 or v2 but I don't know that for a fact.
I do know when your tuner uses a newer software update version or beta new version it might fail like you describe. Thats happened to me.
I just upgraded my old MPVI software suite from 4.01 to 4.10.x today. One of the last tabs at the top is "about" or "update" or something and that will get the new suite file for you to update and load your new .hpt and flash it to your car.
I think you still need to buy hp tuners credits if you get a different hardware/software to license to your car so borrowing one would still entail buying credits for it I think.
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