I have had success in running the latest versions of Armbian on a X88 Pro 20 box. It has RTL8821CS wifi chip and RTL8211F ethernet. I have 2 variants of the box - 4/32G and 8/128G. HDMI works and I have been able to install the Gnome DE and run it in full 4k resolution. Though, there are intermediate stutters while in 4k resolution. Youtube playback is bad. I haven't tested playing 4k video in VLC or any other player yet.   Summary: HDMI - works Gigabit Ethernet - works
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