@EricBoy > If the new firmware can let me to select or set the signal source, I think the problem is resolved. It will not. Deco on its own prefers Ethernet connection and only switches to WiFi...

@Roy-B That speed test result tells me your home office edge X20 may not be placed optimally. While Satellite X20 covers your home office with strong WiFi signal, its connection to Main Deco is weak...

@EricBoy In Access Point mode, your setup should be working. I have similar setup to yours and it works just fine: Router <----------------> Switch <--> Deco Master | \---- <--> Deco Slave #1...

@DMUM The only thing I would recommend is start fresh. Remove all Decos from your home network in Deco app, and after you did that also reset them manually as described in this document: How can I...

@DMUM In your network diagram I see Main Deco not connected by Ethernet cable to the router. Is this correct, or is this just a typo? Main Deco must always be connected by Ethernet cable to the...

@cstmgl If you have devices connected to main router, it makes sense to switch Deco mesh to Access Point mode. In that mode, main router manages the whole network, Deco mesh only provides WiFi...