Backup config
Device > Setup > Operations > export
Download the software and sync to HA peer
Device > Software > Check now
You can jump with in a major release like 10.2.10 to 10.2.10-h3
If you need to go up a few versions you need to go
10.2.5 > 10.2.10 > 11.0 > 11.5
Go onto the standby and install the update
Let that install and reboot
reboot can take 15 minutes
You may see an error on primary that config is not sync'd you can ignore
Disable HA on primary to let the secondary take over
Device > High Availability > Suspend local device for high availability
Install update and reboot on primary
When it comes back up re-enable HA
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