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Originally Posted by HuskerX5
If "backed-up" properly, can this backup be used in my other BMW Nav equipped vehicle with an older version. I have a copy of the latest 2008-2009 Navteq Map version purchased from BMW. I assume I could make two workable/usable discs, in theory. I guess that is my question. 
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If both are the same hardware wise (i.e. MK IV) and software-wise (i.e. High/Professional, etc) then technically there is no reason why it wouldn't.
I have the same car as you - 2005 X5 4.4 - mine has MK IV and requires "High" map DVD. Is this what you have?