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Pcmtec not reading sct3 tunefile


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My friend has used his workshop edition pcmtech to try to read a tuned sct file on a vehicle . 
For some reason it cannot read, the vin comes up with Au xxxxxsct , is this locked by sct3 ?? (Xcal3) .

even the xcal3 can’t scan for diagnostics /codes.

ho tuners cannot even connect at all , protocol error . 
any inputs would be greatly appreciated on how to view the tuned file. 

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