Head units have been Vin locked for like 2 decades now https://www.gm-trucks.com/forums/topic/141045-tech-ii-vin-relearn-for-oem-factory-radio/ https://www.gm-

Head units have been Vin locked for like 2 decades now https://www.gm-trucks.com/forums/topic/141045-tech-ii-vin-relearn-for-oem-factory-radio/ https://www.gm-trucks.com/forums/topic/141045-tech-ii-vin-re... https://www.fordownersclub.com/forums/topic/58554-help-touchscreen-sat-nav-vin-locked/ https://www.fordownersclub.com/forums/topic/58554-help-touch... It's nothing BMW specific. Even Honda has had something similar (a pin derived from your Vin) https://www.ifixit.com/Answers/View/100567/I+need+the+Specific+5-Digit+Code+To+enable+my+car+stereo https://www.ifixit.com/Answers/View/100567/I+need+the+Specif...