Greetings, I am a complete newb to this so would be grateful for any assistance with this initial attempt at setup. I am attempting to put together a small network at home where we have a lot of concrete walls and small rooms spread over three floors. The modem is positioned on the middle floor. Initially I was using one router, the RT-AX57 and when we needed to extend coverage I was moving the router to the ground floor and running an ethernet cable from the modem on the midde floor; this works really well. I have recently bought the RT-AX88U and would like to set this up as the primary router and then use the RT-AX57 as a node downstairs. I want to connect primary router and node by an ethernet cable but today I learned this is not as simple as before when connecting the modem to one router. My immediate query is in setting up the AX88U as primary router and then the AX57 as the node, will I need to do a factory reset on the AX57 to enable me to designate it as a mesh node, given that at initial set up it was itself a primary router. I'd be grateful for any advice on this as when I had an inital attempt at connecting the router and mesh today, well it didn't work!