What year and model car? What look and feel things changed? There are a number of differnet BMW nav systems out there.

The map data are independent of the nav computer OS that give it the look and feel. So, if you only bought and inserted a new map disk, that would not change the nav OS software.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input