H6 not working

USB stick is not supported as boot media on AW SoCs. Only SD card or internal memories like eMMC.

Withholding information is the essence of tyranny. Control of the flow of information is the tool of the dictatorship.

I deliberately omitted talk about FEL boot, because it's not USB boot in usual sense - using USB stick. You certainly can boot LibreELEC over FEL, as long as you know what your doing. It's not plug and play solution, on every board little different, so we don't advertise it.