Handy DIY here, but still, this requires some experience and electronic knowledge. You have been warned.
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Want to retrofit the bluetooth yourself to your E90?
No problem, there you go.
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With preparation (700KB)
Without preparation (900KB)
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BMW co-founded back in 2009 an alliance called GENIVI (Gen In-Vehicle Infotainment) in the purpose of developping a standard in the automotive industry of In-Vehicle Infotainment systems. Basically a computer that fits in the car …
[...] See the rest here: E9x Bluetooth Retrofit Guides [...]