pl_svn wrote ok, what made me think it wouldn't work is: "Note: The Wi-Fi backhaul and Ethernet backhaul won’t work at the same time. When two Deco units are connected via an Ethernet cable, the...

pl_svn wrote Hi looking for confirmation about ethernet backhaul found this https://www.tp-link.com/us/support/faq/1794/ Great! but something in the article made me unsure, so... Plan is to use three...

I see this too, even into backhauk have default hidden network. Maybe it's a WiFi SON feature of IPQ4019 controller on Deco M5. Wifi SON:...

@Ydm this is not main 2.4Ghz of deco M5, i have m5 too and have others 2.4/5Ghz always as hidden. It's a controller network, working only between deco units. I made some tests and when i turn off...

Add M9 on existing network normally, after this, change M9 to main Deco and put M9 as main router. Change M5 with M9 after this. All settings on M5 will be used by M9.

See information here https://community.tp-link.com/en/home/forum/topic/163152