[Samba] Questions about samba upgrade

[Trenta sis]

Hi,

I have two samba domain controllers, and I need to update to a new
samba versions, I have updated second DC (no FSMO roler server) with
the option to rejoin (I understand that is the recommended option
after reading wiki.samba.org)

My questions is now what are the correct steps, I understand that is:
-  before to start samba update on server that has FSMO roles transfer
FSMO roler to updated server
- update server using smae method used on first server rejoin option
- and finally transfer FSMO roles to initial server

Is this correct? any other action or step required?

Transferring fsmo roles and rejoin on this server can generate any
disruption? this is the first DNS server configured on our clients and
usually has FSMO roles

Thanks