x5 2005 cingular treo 650
 

Has anyone had any dealing with cingular 650 & bmw x5 bluetooth. I have
installed car kit download & the dealership had the car for 1 week & every
time I try to activate phone in the car it reboots the treo phone.

I am having the same problem as you are. Just picked up my 05 X5 over the weekend and the phone keeps rebooting everytime it try to load the phone book. I have read on other post where some people got their treo 650 to work but I cant seem to do that either.
Let me know what you find out.