I have a Measy (R-BOX) U4C rk3188. Before I recycled it I thought I would try to get a linux kernel running on it and found this these posts. I experimented with Armbian_21.02.0-trunk_Rk3188_focal_current_5.10.6_xfce_desktop.img from 13JAN. (Thanks Balbes!)
It boots with rk3188-rbox-cs968.dtb and most everything works but the video ouput is color shifted. So HDMI video output is fine but the colors wrong and HDMI audio is not working.
I took apart the Android firmware that was on the thing but with a V3 kernel without uboot it is kind of difficult to see into the kernel. I assume t