I recently bought a 2003 745 LI but the GPS system doesnt work. The guy from the place where i purchase the car told me that he was going to order an upgrated nav disc. i got it yesterday but after i try to insert the disc i found out that it already had a disc inside the system, i pulled it out and it had 2 disc. i put in the new disc but is not reading it. you guys think that the system is demage?