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Old 09-03-2006, 02:54 AM
eaglesrest eaglesrest is offline
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Join Date: Feb 2006
Location: UK
Posts: 76
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Yes your car may go back into OEM mode (7er) and the arrival time navigation feature, along with a few other issues, will go all screwy.

My advice - don't do it, unless your prepared to take it to the dealers to have it recoded.

There is loads of information on downgrade NAV OS in this forum.
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