@YanAndrew It is OK. I have similar setup in my house, works just fine. In my house, three out of four Deco units are hardwired and one is wirelessly connected to Main Deco.

@RadekB Please confirm: 1. You have deleted (reset) all Deco nodes from Deco network, by following this FAQ, section "Reset a Deco unit:" https://www.tp-link.com/us/support/faq/1457/ 2. After that,...

@RadekB The easiest would be to undo what you have done, and start again. Steps: Delete all Deco nodes, one by one, from both Deco networks. When you delete Deco node, it will be reset. Delete both...

@Tiger-TP From what you described and confirmed by screenshot, your Deco X60 experienced hardware failure and can no longer broadcast on 2.4GHz WiFi band. If it is still under warranty or return...

@FranCruzarianic If you want good WiFi coverage in every room, buy six Deco X20, put one per room and connect each to Ethernet. I can't speak for other brands of WiFi mesh, but if all you need is...

@Tiger-TP For that problematic Deco X60, what do you see under its Signal Source in Deco app. Example: Specifically, do you see 2.4GHz there, like in that example, just 5GHz, or what else? Would be...