Swapping an existing Mesh network over to full fibre
I have 3 Deco X60s connected to a Plusnet Hub One modem/router (with its wifi disabled). All works satisfactorily for me. However, we're in the process of swapping from an FTTC copper connection to full fibre with a different provider. The new router will, as I understand it, be a Fritz!box 7530 connected to the ONT.
how do I swap over with minimal disruption? I assume it can't be as simple as swapping the Deco over to the back of the new router but I'm hoping I don't have to try to reset the Decos back to factory defaults and set up again from scratch.