I had the same problem when I brought my E70 for the Backup Camera issue. The software waas upgraded and the SA told over the phone that the issue was fixed. Wehn I wentto the dealership to pick the car. Guess what... the Camera was set to display off due to the software upgrade. Called the tech and he confirmed this. How in the hell did they checked and confirmed to me over the phone that the Camera issue was resolved. Once I got home, The faulty Camera acted up again. Called the Service Manager and was aksed to bring it any day. Few days later called him up and he asked me to bringthe car over. He said to look for someone to get the issue resolved immediately. Well, the Service Manager and the person left for the day at 4:00 p.m. The Master tech tested it out and couldnt replicate the issue, did a diagnostic and said there was a loose cable. It is broken again when I got home. No call from the Service Manager. JMK BMW is the ddealership.