Hi. I just bought a 2012 bmw 120d (F20). It has no idrive which is fine but only after the car came home we realised there is no usb port or usb icon on the media library of the radio. Whoever had the car before me had the y-cable installed in the front but it plays the usb music through aux so no info is displayed on the screen. Does anyone know what it costs to upgrade it and get the usb functionality? Or any other suggestions? Thanks