I have mxiii with s812 and i used Armbian_20.09_Aml-s812_focal_current_5.9.0-rc7_desktop but at the start it start to change resolutinons on my tv and next the black screen telling that "resolution is not supported" message in tv.
I changed resolution in uEnv.txt but allwais the same. But the start proccess is fine only it try other reslolutions and at the end, black screen. Anybody know how to suprime this tv resolution test or force some resolution? thanks