Hello All,
could you please help me to have an AUX IN port on my radio (in subject). I'm a little bit desperate. I build my cable and connected the AUX Audio Jack pins (LEFT, RIGHT and Common GROUND) to the respective pins on the radio but I can't switch to AUX when I press MODE button. Only RADIO and TAPE are available. Do you think I need to upgrade the firmware on the radio? If yes, how?

Thanks in advance!

Bye,
Salvo