From https://github.com/morrownr/8821au-20210708

Welcome! This question is a bit off topic here as general Armbian updates are not part of HA extension. As this is community supported hardware, stable BSP upgrades - where OS version is stored - might not be generated, while kernel and everything else is getting upgrades. tl;dr; Don't worry about this. For board related topics proceed here https://forum.armbian.com/forum/173-allwinner-sunxi/

Hey if it’s still available I will pay the shipments

Hey, @arbeiter! It shouldn't be necessary to put the device in Maskrom mode, Loader mode should be enough - you can do that by using a toothpick to activate the reset button in the 3.5 mm jack (example photo attached) before plugging the device with the USB-A-USB-A cable. For the flashing - you should run rkdeveloptool ld (to list recognized devices) and see if the box is in LOADER mode rkdeveloptool write 0 Ambian-unofficial... Here should be the latest gnome desktop verison that I compiled. Please be advised that your version is M9S and, as far as I know, the only difference is that M9 comes with Android and M9S comes with Android TV; this image hasn't been tested on M9S. Don't forget to freeze the kernel updates from armbian-config; you should be able to update the other packages normally after this. For me the box has been stable, no hangs whatsover and, as described, the VPU and the NPU work, but the GPU doesn't (that's why it's blacklisted). Haven't tried the remote nor the LCD screen.

Was this 8812au.ko in the lib/modules folder originally, or did you copy it from somewhere else?