I have found bulk errors in rk3566-box-demo.dtb and managed to mend the file. I attached the one for x96_x6. I just copied from other dts files :X)
The errors were for usb ports, cpu ang gpu. Ethernet doesn't work in my box because also fails in android and don't know if it is a broken hardware phy.
rk3566-box-demo_x96_x6.dts
rk3566-box-demo_x96_x6.dtb