I have the subject vehicle and considering replacing my now nonfunctioning unit with an android unit. Has anyone had a successful experience such a task? My sound system was diagnosed. I was told all is well except the radio unit. Seeking help in getting sound back in my car. Al Banker
Found this searching - more digging maybe you can find more - bimmerforums, bimmerfest, etc. https://www.bimmerfest.com/threads/2004-645ci-stereo-options.1415974/
