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I used this diy successfully this morning, I learned a few things that'll hopefully save future diyers some time. For reference this is on my 2011 E90 with the BMW Professional stereo and Harmon Kardon sound. My phone is a OnePlus 6T.
1. I coded my car before I installed the ebay box. It worked fine, but you will not see the CDC option on the headunit until you install the box. I wondered if the car was smart enough to figure out the I didn't have the CDC yet, it was.
2. I didn't have $694 on my VO/FA list. I suspect that was an LCI change maybe?
3. If your car has bluetooth for phone only, and you want to retain that functionality, make sure than you flip dip switch #4 first before you pair your phone. If you adjust the bluetooth profile for the ebay box at all (like disabling the phone), you can't stream anything.
4. Previously, I was using a Kinivo BTC450 through the factory aux connection. That box does support aptx. However, due the low quality BMW aux, I do think the ebay box sounds better. Not earth shatteringly better, but some better.
All in all I think this is the best (and cheapest) option we have for decent quality bluetooth streaming and retaining the steering wheel controls.
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