dudu-lai I plugged the subwoofer RCA into the left/right front/rear and nothing changed. Getting the subwoofer working is my #1 priority at this point.
The radio app does not do anything. This unused connector is what goes to the radio antenna.

Also whenever I go into the AUX application it shows my right turn camera. Is that normal? I plugged my phone into the car's aux port and I cannot hear anything.