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Achtung! Hochspannung!
2018 i3, 2020 Arcimoto FUV
1,531 Posts
Welcome to Bimmerfest! Moved this to the E9x subforum, they are better equipped to answer this question :)

6,180 Posts
There is a whole e90 stereo board at this link.

Find out if you have Logic 7 or Hi Fi first
read BMW stereo types.
Updating it won't get you any further you need to change it.
The following links are for sound quality .
If you want features.
If you have idrive there is the NBT upgrade for features.
If you don't there is the dynavin N6 Head Unit .

BMW stereo types
electical e90 pdf,d.cGU&cad=rja,d.cGU,d.cGU

Best System examples
Logic 7 upgrades
Base System Upgrades
HI Fi upgrades
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