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Please make sure to backup your current config file.
Please download the following upgrade file from support.fortinet.com on your desktop. Click on [Update] beside Firmware version under System Information widget when you click on Dashboard in GUI and browse to the downloaded file.
Kindly check if the HA status are in sync under System-->HA
The cluster units can see each other?
How the Heartbeat interface connected? If is there any switch in between?
If the HA is out of sync , kindly do the following during the maintenance window to fix the sync issue :
For the synch issue with your ha cluster, the most reliable way to make sure everything syncs back together is the following.
disconnect the secondary unit (all wires)
perform a factory reset (exe factoryreset)
Backup config file from master
restore the config from the primary unit on the secondary.
from the cli, change the hostname
config system global
set hostname xxxxxx
change ha priority lower than the master
config system ha
set priority xxx
shutdown the unit
re-attach ha heartbeat cables only
turn on the device and wait 5 minutes.
re-attach remaining cables.
This will ensure the proper config file is on both devices and they will sync. It will also ensure no network disruptions.
Kindly let me know, how it goes.