# BACKUP
# apt update
# apt upgrade
# nano /etc/apt/sources.list.d/armbian.list -> comment out the armbian repo
# nano /etc/apt/sources.list -> change to debian bullseye repositories
# apt update
# apt upgrade --without-new-pkgs
# apt full-upgrade
# reboot
# nano /etc/apt/sources.list.d/armbian.list -> reenable armbian repo
# apt update
# apt upgrade
#Leave a like if it worked.