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It says controller mismatch because the tunes you are flashing in are either vin or serial locked. When the flash fails the ECM temporarily loses its Vin/OS/Serial data and as such the locked tune will not be allowed to be flashed into the truck. For this reason I provide a clean unlocked stock tune for my customers to recover their trucks if need be. All the newer Diesel ECMS are like this.
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that sounds great, we never got a stock one, just modified one.
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yeah using the RSA patch works just the same as using the stock file.