I've just tried to code Bluetooth module to an a4. I Dont have access to full logs right now as battery is flat but iirc it was coded to 0010310 or very similar, I wanted to code to 011822 or v similar
The only digit I can code successfully is the second from last. All others say code rejected. There is one fault code which is communication with radio that won't stay gone. This doesn't affect the single digit being coded. Occasionally loading the 77 channel will result in blank coding until I restart .