Have tested the Orange Pi 5 Ultra and the Armbian Linux v6.1 vendor IOT image for the 5 "Max" model, using the same Max' `rk3588-orangepi-5-max.dtb` FDT file works better than with the rk3588-orangepi-5-ultra.dtb (extracted from the old official Orange Pi image), as surprisingly, dmesg shows less errors with the Max DTB.   Tested: ✅ eMMC works. HDMI ports: ✅ Port 1 out works fine.  ❓ Haven't tested the port 2 input. Would guess it doesn't work as