I've just received the long overdue solution from china factory, but can try it only if im 'competent'
HI, the factory are slow to respond but i ask again and they say this
2, If you truly want to try, you have to find a controller cable from original car AMP, then connects to our board mute cable( but our mute cable is painted on the board, there is no cable outsid额）
I assume when you open our system, you can see cable which says MUTE and then connect this to the amp wire.
They baiscally want me to look up the data sheet of their chinesium copy of the AMP or DAC, find the amp mute pin and connect it to either mute wire of the bose (which doesn't exist) or maybe connect that mute wire in place of the amp on trigger wire. As you can tell im not too sure as their instructions are not the best.
There isn't a pad, pin or a leg labelled mute on the internal pcb's as ive had a look already.
Good luck to anyone who wants to do SMD work to get it to work their way
