On my ONN 4K Pro, the Shortcuts (blue, red, green, yellow buttons) don't work for me via keyboard shortcuts. F1, F2, and F4 don't work at all, and for some reason F3 launches Netflix(?).
I'm trying to set this up using a Flirc, hence the keyboard shortcuts. They don't work via IR remote or with a keyboard plugged directly into the ONN USB port.