90% you may have trouble.Open ECU, read boot mode,do T prot off, write again in boot mode tprot of file, and, than , can close ECU, and write by OBD any tuned version you want, but useas base file the file without T Prot off. Anyway in case of fail, you have back up ,, mean bin file, EPR and MPC file.
i understand you say,but owner car dont know how to do a boot mode,he ask me if its possible over obd and i say yes but i dont be 100% sure for the Tprot