Hmm, I wonder if it would be possible just to buy a new computer unit and swap it in? There was a guy who did a retrofit from non-nav to nav and it all worked, seems like it would be a similar upgrade. In my 2003 Range Rover it had the early CD-based Mk3 nav computer and I upgraded it to the DVD-based Mk4 nav computer and it was an easy swap. Got much better graphics and a vastly improved UI too.
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