+1 to what Roy said. You connect NavCoder, and at the bottom of the navigation coding screen, there is a checkbox for color or monochrome. Select color and click the code button. It will prompt you for an OS update CD, and then you are done.

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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