I did the upgrade from Buster to Bullseye.    As far as steps: - Backup - apt update & full-upgrade - Disable /etc/apt/sources.list.d/armbian.list all entries to stop armbian from upgrading - Use normal debian upgrade steps -> Change release in /etc/apt/sources.list  - apt update & full-upgrade - Restart, validate working system - Update /etc/apt/sources.list.d/armbian.list with new release (buster->bullseye) - apt update & full
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