Reinstall one node in a cluster?

[sajbermaku]

Hello,

My first post, hopefully I placed it in correct section.

We are running two Pfsense firewalls with latest 2.4.1 software release, I'm wondering if it's possible to reinstall one of the nodes without disturbing the working firewall?

I've placed the main firewall in "Persistant maintenance mode" to let the other firewall take over as master for the CARP interfaces.
Do I need to do something more to be able to reinstall Pfsense on the main firewall?

Grateful for some information about this,

/Markus.