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      06-20-2018, 11:30 PM   #23
Bstears
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Drives: 2011 BMW Z4 35I
Join Date: Jul 2017
Location: Tucson, AZ

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https://www.bimmer-tech.net/shop/bmw-z4-e89/connecteddrive-retrofits/combox-media-pnp-retrofit

Bimmer-tech sells the combox and the cable used to program it. They give instructions on how to install the unit, then you use a USB cable with a laptop which allows them to remotely connect to your car and reprogram the car to gain the functionality of the combox. I've seen somewhere that you can purchase a used combox for much cheaper, but then someone must reprogram your car to accept it. I'm not sure how that would work.
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