After owning my BB 7250 for almost a year now and NEVER getting it to work with my 2005 X5 w/BT...I downloaded a recent software upgrade from my cell service provider and voila...works fine. Everything EXCEPT phonebook transfer. Evidentally, s/w versions 4.02 and higher allow stable connections to the BMW BT modules, and s/w versions 4.1 and higher also allow phonebook transfers (there is no version 4.1 available for the 7250 yet).