I am still running 2.1 on my HTC desire (Orange UK) in my E46 (330 ci) and never had any problems synchronizing my address-book with he car. I get the occasional connection drop if, when I attempt to call someone, I hang up before they answer the phone or it goes to answerphone. Apart from that it works OK. Some people on an android forum though seem to have problems synchronizing their contacts, most of these people have trouble with contacts that have pictures. Mine are all OK, even the ones with a picture. Just a though. Are your contacts google contacts, phone contacs or sim contacts? I only have phone contacts.