It worked… Until I did something, and then it didn’t. Installation went fine, I booted into CoreELEC, switched System resolution to 2160p (no issues), but then when I changed to “render GUI in 4K” in the CoreELEC settings and rebooted the gadget, I can only see the initial CoreELEC logo, and then only black screen.
Is there a way to reset CoreELEC to the original state?
Never mind, I ran “systemctl restart kodi” from ssh, and it brought back kodi. It does looks sharper, so perhaps it does use 4K GUI. But it looks this mode is unstable. I’ll check if I need this mode to render my images in 4K without downscaling.
BTW I still have SSH access into the box.