Originally Posted by KiwiJochen

BMW don't repair "control units", they replace themwith new ones.

So BMW will tell you to fita replacement nav computer.

Only 2 x repair facilities that I know of:

1. Factory repair: VDO in Wetzlar Germany, they are the repair facility for VDO and have all the factory tools. They can do anything.

2. Autotronic in Melbourne Australia (on this board or on bimmerboard). He's a smart electronics tech that can reflash the nav for you.