You can find a ton of specific information for your car on forums.e60.net.

You can get into your CCC "secret" menu following the steps below. Then, go into the navigation section to find your OS version. I do not know the latest version available, and only a dealer can update the OS.

• Push down knob 15+ seconds from the initial screen (after eliminating the US disclaimer screen)
• Turn 3x right
• Turn 3x left
• Turn 1x right
• Turn 1x left
• Turn 1x right
• Push down and release

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SOLD
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