Just connected my new JY-VO130P4 and have no sound, from car speakers.
My theory is that the unit does not start the dynaudio amp.

Updated firmware
Connected an external speaker to harness and got sound.
This was solved by disconnecting battery for 20min, noe the amp follows acc.
The new problem after updating is that the head unit (JY-VO130P4) is now always on, still on after ignitions is off and key is out. And drains battery.
Firmware "FYT 安卓8.0 1024X600 DVD Android Auto+EQ 2018.11.7.zip"