I have a MOST hifi radio without L7 and I can do whatever I want since I use the latest version of nc-expert and daten file. Are you tried the v47? I use a cheap usb dcan cable and I bought this radio http://www.ebay.com/itm/BMW-professional-bluetooth-car-radio-CD-MP3-player-bluetooth-USB-optic-INPUT-/230879432199?pt=Car_Audio_Video&hash=item35c17c8e0 7&vxp=mtr
If you reset but didn't get the sound setup, there is something wrong in your coding setup. Maybe you don't have the choice to use a MOST cable with L7..