@iGOD From screenshots, I don't see any obvious problems with Satellite Deco and their connection to Main Deco. Still, I would suggest moving Living Room Deco closer to Main Deco, you said they are...

@iGOD Thanks. Please also add Living Room Deco screenshot.

@iGOD When your Satellite Deco are online, open their info pages in Deco app. You should see similar to this example info: In this example Signal is Fair. Also, connection from Satellite to Main Deco...

@RayGMan I would recommend for you to do two things: 1. Bring Deco #3 to TCL TV stand and connect TV to M5 with Ethernet cable. Check TCL TV settings to ensure it uses Ethernet, some TVs may require...

@14paavang Are you sure about Deco M5 dimensions? I have Deco M5, it is just 2-3 cm tall and about 12-13 cm wide, or 1 inch tall and 5 inches wide in imperial system. I don't think you could find any...

@Clements42 When Satellite Deco uses Ethernet backhaul, it'll report it as Ethernet. Example: Your Satellite Deco does not use Ethernet for backhaul, if it keeps reporting WiFi. Start with this FAQ:...