I mean Facelift, they got leds, updated nav, and some other estetic, i belive this was in 2007.
About the new DVD, the file stucture looks a lot like it did on my Benz that had Becker/Harman System.
I dont think the Nav unit CCC changed, maybe just something abut it maybe software for it?, the dealer could not give me answer for that, but he was prity sure that old model could not be updated to show map.

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005