@SamuelB1002 Main Deco is a router. What you have on that photo is two, maybe three, routers connecting to each other. This is not right. I am trying to see if you can get rid of "Internet box." You...

@SamuelB1002 Now that all three Deco are on 1.6, you can use Connection Preference feature to connect them to each other the way you want. See How to select a preferred signal source on the Deco App...

@SamuelB1002 If manual firmware update was successful, you should now see firmware 1.6 for all Deco nodes in Deco app. Make new screenshot of Update Deco page in Deco app and post it again, to...

@PeteFl If you have a Virgin media super hub (UK) running in its default router mode, I suggest for troubleshooting purposes to configure Deco mesh to run in Access Point mode. You can undo that...

@Ivan_Yeung According to Deco XE75 Pro hardware specifications, it has 1× 2.5 Gbps Port + 2× Gigabit Ports. To have 2.5 Gbps on desktop connected to Main Deco by Ethernet cable, you will need Main...

@SamuelB1002 Kantoor Deco node firmware is very old, so old it can't be updated through Deco app. It must be updated manually. Follow Method 3 from this document: How to Update the Firmware of Deco...