@tpliiiink Usually you can have Deco in Access Point mode assigning IP addresses when it loses connection to router, Freebox in your case. When connection is restored, Deco will yield to the router...

@tpliiiink Have you added new X20s to existent Deco mesh network, or have you created 2nd Mesh network for them? If you added them to existent network, you should see all of them together in Deco...

@djthirdy1316 Yes, you can turn Satellite Deco off when not in use. You can't configure to turn them off in Deco app, but you can just unplug them or connect through smart plugs which will power on...

@GlennLDN If you have to run WiFi on router, make it with different SSID than Deco WiFi and have everything else connected to Deco WiFi.

@bigmac155 So, you do have router. Yes, you need to turn all of these off. No, you do not need to put your router in bridge mode. On router, turn off WiFi and change no other settings. On Deco,...

@GlennLDN Thanks for clarifying. It is recommended to turn off main router's WiFi after Deco mesh is deployed. If you follow that recommendation (and you should), the answer becomes obvious: you must...