have an 07 with almost all the bells and whistles and have been through the iDrive several times and bluetooth audio does not work for me either
tried a portable hard drives, don't work
- haven't tried usb thumb drive yet as i have tons of movies and music on my hard drives and cannot fit them to a thumb drive, may for testing purposes put a couple songs or music video to usb thumb drive and see what happens
tried playing music through ipod cable, doesn't recognize my iPhone 5 or wife's iPhone4
currently we are running audio from our phones with an AUX cable like most others