I just tried connecting the HTC Desire S with a 2004 X5 E53

I had several random disconnects
the phonebook did not load
no sms on the screen

and the main problem: in the car's phonebook, under the name of my current phone on the navi screen is loaded the phonebook of a nokia 6233 which was connected only once to my car in 2007 for testing purposes!!!!!!!!!!!

how can i delete the old contacts from my car?