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Originally Posted by jharms
I've got a 2008 X5 with a Nav system. What is it? a MK IV? Other?
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Other. the 2008 X5 is a n E70, the 2nd generation X5.
You do not have a MkIII or MkIV, you have the iDrive system - totally different.
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Originally Posted by jharms
What OS am I running?
Do I need to upgrade it?
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Look in the service mode of the system, which can be accessed via the iDrive controller. Instructions and pictures of service mode are here:
Screenshots of the hidden/secret menu [access to GPS speed too] - The Unofficial BMW M5 Messageboard (m5board.com)
The only way to update the software is via the BMW dealer diagnostic system