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Originally Posted by molva2
I currently have a 2005 Z4 with NAV. I have the MKIV and v4-1/42 or v24.1.
I'm wondering if I 1st need to upgrade to v25, then v26, then v27 or if I can just do v27?
Does v27 have teh previous updates in the otehr versions?
A newbie question 
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You can go directly to V27 and your system will be completely up to date.
