You can remove the association between two SonicWall firewalls on MySonicWall at any time. You might need to remove an existing HA association if you replace a firewall or reconfigure your network. For example, if one of your SonicWall firewalls fails and you need to replace it, or you might want to swap the Primary and Secondary roles after a network reconfiguration. In either case, you must first remove the existing HA association, and then create a new association that uses a new firewall or changes which unit is the Primary firewall and which is the Secondary firewall (see Replacing a SonicWall firewall).
To remove the association between two registered SonicWall firewalls: