Clustered devices, devices in high availability pairs and Firepower Management Centers in high availability pairs must run the same Firepower version. Although the uninstallation process triggers an automatic
failover, appliances in mismatched pairs or clusters do not share configuration information, nor do they install or uninstall
updates as part of their synchronization. If you need to uninstall an update from redundant appliances, plan to perform the
uninstallations in immediate succession.
If the uninstallation process on a clustered device fails, do not restart the uninstall or change configurations on its peer.
Instead, contact Cisco TAC.
To ensure continuity of operations, uninstall the update from clustered devices one at a time.