If your steering wheel control is not working, please use this guide to update the firmware.
https://drive.google.com/file/d/1gJhn8wLTN4ExvhDFCs5omNtVbr850T8s/view?usp=sharing
Please download the file "Tangdu.bin" onto your computer, make sure the name stay as "Tangdu.bin". Move the file to a flash drive and do not put it in any folder.
Plug in flash drive to the unit, go to setting > System Info > MCU update > MCU update > Tangdu update > You should see a progress bar appear and wait for it to complete if the previous setup is correct. The unit will reboot after progress bar complete.
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