Firmware Upgrade to 5.4.5 1138

[Agianna]

Hello,

i have changed my Firewall last year and now i have a Fortigate 200D in HA Active/Active.

My firmware level is 5.2.11

I would like to upgrade it to 5.4.5 1138

First I will do all the needed configuration backups , but in the meantime i'd like to ask if there is some known issue or best practice to keep in mind.

As far as i can imagine, as i upgrade a cluster there should be no downtime for the users

Thanks in advance to all

[btp]

5.2.11 can be upgraded directly to 5.4.6 (or 5.4.5)

http://cookbook.fortinet.com/sysadmins-notebook/supported-upgrade-paths-fortios/4/ 

As a cluster should remain up during the upgrade, I would do this in a maintenance window. Murphy lurks around..