Hey
HAve the same problem. Went through countless discs of different brands. They were all DVD+R. According to a poster on here, the DVD needs to be called NAV_DB. The version I downloaded (t*rrent site) calls the DVD "CD_5171". This might be incorrect OR it just might be for the newer E90 vehicles. In any case, I've dumped the DVD to my HD, and re-mastered it into an ISO with a title of NAV_DB. I will try it out in my car in a few days and let you know if it works...