Downgrading HA-pair

I would like to confirm a downgrade/rollback procedure for a SD3820 HA-pair.
In this case we need the procedure be prepared for a rollback from 6.3 to 6.1 in
case we run into trouble after the upgrade to 6.3. Is this sequence of commands
correct assuming both nodes are running 6.3 and we need to roll back to 6.1?

 

1. Change image in bootparam on the standby node to point to 6.1
2. reboot (standby node)
3. verify-config (to make sure configuration was converted OK)
4. sh version (to verify that the image is 6.1)
5. sh health (to make sure the nodes has synchronized)
6. notify berpd force
7. restore-backup-config config-61.gz (restore the 6.1 config on the primary node which is already downgraded)