My retailer gave me the instructions below to reflash the stock firmware on my MXQ Pro 4K .
1).Open the zip file and copy the files to your SD card then insert the SD card into the TV Box
2).Plug HDMI cable then use a small stick press the upgrade button (which is in the AV port) and hold on.
3).Connect your device to the power supply.
4).When you see is upgrading then let your hands go.
1).Open the zip file and copy the files to your SD card then insert the SD card into the TV Box
2).Plug HDMI cable then use a small stick press the upgrade button (which is in the AV port) and hold on.
3).Connect your device to the power supply.
4).When you see is upgrading then let your hands go.