You're right - the 3g+ main 5F unit is all-in-one - mmi, navi, bluetooth, dvd etc, not seperate units like it was with 2g. I think swapping the 5f unit should be it, only thing i'm not sure of is whether an aerial connector for sim is present or maybe needs new aerial amplifier+cable from amplifier. I havent done any work on 3g+ so don't know - it must have been discussed somewhere on the internet.
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 2010 Audi A8 4.2 TDI
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