This is a mail-in variant of the Bosch MDG1 ECU unlock service, not a physical part. The customer ships their removed ECU to the provider's facility, where it is bench-processed to defeat the factory read/write protection on 2020+ BMW Bosch MDG1 units, then returned (commonly within a day, via insured courier) ready for aftermarket tuning. AutoTuner's own "BMW Bosch MDG1 (2020+) - Mail-in Unlock" listing describes this exact process, covering 11 compatible ECU variants across BMW, MINI, Rolls-Royce, Toyota, and Land Rover.