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You can stop trying. The Professional Nav in the E90 can currently NOT play MP3. Only the non-Nav Professional.
As usual the dealer doesn´t know a thing.
With the Nav Professional, the hardware is prepared for MP3 but the Fireware/Software currently does not support it. BMW is working on the Software for it, so it might be possible to add MP3-capabitlity via SW-upgrade later.
The Problem is well known and documented in the German dealer and buyer catalogues.
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