Description
When 2 FortiGates are in HA Cluster, the “boot alternative firmware” option is not available via the GUI. To be able to use the “boot alternate firmware” option, it is necessary to break the HA Cluster (For example shutdown the Slave FortiGates). After all Slave FortiGates have been shutdown, the “boot alternate firmware” option will show up on the Master FortiGate.
After booting the Master FortiGate using alternate firmware, you can power off the Master FortiGate and power on each Slave FortiGate in turn to use the “boot alternate firmware” option. After all FortiGates are booted with Alternate firmware, they can then rejoin to cluster.
