Hi,
Just wanted to share my experience thinking I had bricked the Jumper Ezpad 6 Pro tablet by changing UEFI settings.
I pressed and held the power button for a long while and kept it plugged in to power supply. It seemed like nothing would happen, I didn’t see the Jumper logo or Windows boot splash or anything. Then I got occasional flashes of the Windows log in screen. I realised that the screen seemed to be staying on for a few seconds then turning off.
So my solution was plug in with micro HDMI cable to external monitor and it worked. I was able to go into Windows Settings -> Update & security -> Recovery -> Advanced startup and click Restart now. Then I went Troubleshoot -> Advanced options -> Startup repair or something like that, I’m not sure which one and eventually could get into the bios and use reset bios settings and everything was fixed.
So don’t forget to try HDMI if you are having these strange screen issues.