http://www.bmw.com/com/_shortcuts/update. I tried to perform an update on the Bluetooth module, however this was not necessary as it was up to date. I did this because the iphone 4 that connected to my car did not load txt or emails. I noticed my vin was deemed incorrect after several attempts and checking my vin multiple times. The following evening it worked. I'm guessing the vin was temporarily suspended while BMW updated my cars vin profile following the retrofit.