2g Mmi Upgrade To 3g High

The Rainmaker

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I've performed a search, but couldn't find a definitive answer to this after someone completing the retrofit.
Basically wondering if a 2G MMI System (Audi A6 C6) can be upgraded to 3G Low or 3G High system, and if so, what are the part numbers for the parts required (operational sat nav).
Thank you for your help.