Hi SteeMan,
I successfully installed Armbian_20.10_Arm-64_bullseye_current_5.9.0_desktop.img on my tv box. The desktop appeared with no problem.
The only problem now is the wifi adapter. I started, as I used to do on x86 linux desktops, to find out my hardware with lspci but I had no output :-/
Can you share a way to handle or analyze the wifi problem on armbian?