Hey guys just joined i own a 2002 330Ci Convertible and i have just upgraded the nav to the MKIV but im having problems with the unit reading the navigation disks, is there some way that i need to initialize the unit to the car? I have had some of the guys from work (BMW dealership) program it with no such success but none of them have ever done an upgrade much less changed one on an E46...i have forked out a fair price for this unit so i would really like it to work

any help would be greatly appreciated