@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:...

@Giddorah Just a suggestion: what if you power off both managed switches, so that you only have two unmanaged switches up. After that: 1. Will Secondary Deco still use Ethernet backhaul? 2. Will...

@Jim27 Well, as I said, you are out of luck with software Connection Preference feature, with what Decos you have. If it is possible, you could try Ethernet cable or Ethernet over coaxial (over TV...

@Jim27 Unfortunately, not one of your Deco X20 supports Connection Preference feature. They have different firmware versions, because they came with different hardware version. I am guessing, you...