For Model Upgrade on a High Availability pair, you need two activation keys, one for the primary unit and one for the secondary unit. The primary unit upgrade key is generated using a regular SKU, while the secondary unit upgrade key is generated using an HA SKU. First, associate the HA pair (if not already associated) in MySonicWall before the model upgrade, then perform similar steps as you would for a single node model upgrade on both the primary and secondary units to complete the model upgrade on your HA pair.
To perform a model upgrade on a High Availability pair
Restart the NSv if prompted, or navigate to DEVICE | Settings > Restart and click Restart System to reboot the primary unit.
After bootup, the NSv will stay in the STANDBY state and the previously idle (secondary) NSv will become the active unit
Restart the NSv if prompted, or navigate to DEVICE | Settings > Restart and click Restart System to reboot the secondary unit.
While this unit boots up, the first unit becomes active again and the HA Pair is upgraded and synchronized.