I'm far from an Android headunit expert but that won't stop me from posting...
What have to done to turn on the DSP amp when your headunit is powered on? In my install I chose to us the Resler IBus interface with the DSP option which send the power-on signal to the DSP amp and allows you to control the amp. The IBus interface also integrates very nicely to provide the factory OBC functions (plus more) through the headunit.
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