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I was curious about this in 2015 and it wasn't possible then. 2009 e93 with CIC, and then I had the bluetooth upgrade (used to only receive calls, no media) as well as rear camera installed.
I also found the unichip online but some of their photos show as the UI being stretched and then videos i found were in chinese for installing, but like you, not really any feedback on how it all works.
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