@RikHCA What is the Deco M9 Plus firmware version? What are floors made of: concrete, wood? This is what I can suggest for troubleshooting: 1. Switch Deco mesh to Access Point mode and keep it in...

@sibuncis It is not possible to make chain connection with Deco nodes. This is the feature users asked TP-Link to add for a long time, but as of me writing this it is not delivered yet. The first...

@Chris_82 Any standard Ethernet cable can do when you bring configured Deco nodes to their permanent places. For initial configuration of first Deco node you will have to connect it with Ethernet...

@Chris_82 The first Deco node you configure during the initial setup will become Main Deco. You will be asked to give name to each Deco node, and you can see which one is Main in Deco app: The one I...

Chris_82 wrote So now I just follow the instruction on the app for initial set up and do what that tells me, and once complete move the deco's where I want them @Chris_82 If you need recommendation...

@tmac51 I would suggest bringing one of Satellite Deco M5 to where your Android TV Box is and connecting them by Ethernet cable. I googled Mecool MK2 specs and what I found says it has Ethernet port.