Well, did you have your latest backup? if yes. My recommendation is to reinstall armbian and install docker and follow the new supervised installer.
I believe Armbian Buster == Debian Buster, so you should be able to follow the guide to install it and then restore it. I recommended that you add portainer into the docker list, so you will be able to see what is happening on your docker installation.
Again I’m not sure whether armbian buster considered official but since it’s Debian Buster then you should be able to install it. Please let me know how it works out.
a very good guide to follow, however, you should only install using the official Github GitHub - home-assistant/supervised-installer: Installer for a generic Linux system