i've seen some issues with the chinaradios having some settings behind pw that you need to change that are vehicle specific. does any other audio source work, or just radio?
i mean, you should tape up your oem wires either way. but it almost sounds like the ATT is enabling if you HU has that feature. pg 86 of your manual, try turning the feature off and see if that happens to do anything. then start testing things individually. disconnect the sub amp, run the highs...
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