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Originally Posted by pknguyen
I was wondering are there any differences between the various MK4 units?
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No. The changes are basically minor improvements over time. Eg: hardware version 1.0 was improved in hardware version 1.1
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Originally Posted by pknguyen
For instance are the connections/plugs on the back any different or does the loom I have (which is specfically made for X5 retrofit) basically connect into any MK4 unit, regardless of its part number.
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Connectors are identical, loom works on all Mk3 and Mk4 navs
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Originally Posted by pknguyen
Also do all MK4 units work in Australia or are they for some reason region locked?
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They are not 'locked' but the nav does get programmed for different regions.
ie: a nav programmed by BMW for region=Australia will offer an annoying 'nag' screen telling you to watch the road and not to play with the nav when driving.
But if the nav is programmed for region=Europe, then you don't get the nag screen
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Originally Posted by pknguyen
Does the parts number really matter for the MK4 units or should I try my best to keep following the official parts list I have?
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Part numbers don't matter, just make sure you get a Mk4, and not a NAVI03