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I did the 6FL USB retrofit, although I did mine with a CIC installed in my 2007 E90. I could never get an answer if it would work with my CCC. However, when I removed my CIC to sell the car, the USB port still worked with the CCC.
I bought all the components from the OEM USB retrofit kit... the MULF, the USB hub, the harnesses...everything. I downloaded the manual and bought all the parts from the online parts listing and got the MULF on ebay. It was a fair amount of work, but in the end it was great. I just followed the factory instructions for the wiring and it worked out fine. Believe me, you don't already have any of the parts necessary to make it work - you have to put in the port and ALL associated wiring, and the module to make it work. For whatever reason, BMW says that the the 6FL would not work on my car (too early of a build), but it did ultimately work.
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