I am using meson-gxm-q200.dtb. Also tried to use this dtb from debiangamer's build (same name), it is slightly different, but it did not help.
I know it will be a long way to solve it. I was just interested if anyone had similar box and got it working.
When I fully updated debiangamer's build using apt, Firefox stopped working correctly, it had some issues with GUI and graphics, it was broken. Chromium worked still and even the sound still works there. But, when I test the audio in KDE system settings, I have the same error like in the latest Armbian community build (something with the driver).
edit: the link to original (locked) post: