I tried to plug my V88-4K (rk3229) box to a monitor (supports touch but whatever) that is capable of:
640 x 480 at 60Hz
800 x 600 at 60Hz
1024 x 768 at 60Hz
1280 x 800 at 60, 60RB Hz
1280 x 960 at 60Hz
1280 x 1024 at 60Hz
1360 x 768 at 60Hz
1366 x 768 at 60, 60RB Hz
I couldn't manage to make it sync so, no image at all... it tries to auto sync to the box with no result.
Do I need to change anything in the SYSTEM image, add some file to my SD card root or folders?
try to open file on sdcard first partition extlinux/extlinux.conf and remove/adjust the resolution inside kernel parameter 'video'