upgrading the firmware of HA cluster devices running with the Transparent mode.

Hi,

I want to upgrade FGt HA cluster, I have read many articles, but didn't found anything about upgrading Transparent clusters. Is it the same as upgrading NAT mode clusters? I am asking because as we all know we can't configure Transparent HA cluster immediately, you need FGT in NAT mode to form a cluster and then convert the to Transparent.

Is it doable to upgrade HA Transparent Cluster?

Thank you