@AlbertH999 There are no configuration settings in Deco mesh to increase WiFi signal level. You could try placing Deco units upside down, so that their antennas point down from the attic, and see if...

@SamuelB1002 Please make screenshot of Update Deco page in Deco app and post it here. This will tell me firmware versions of all of your Deco nodes. Example: Also, run Test Internet Speed from Deco...

PeppeL wrote @Alexandre. I saw that Tp-Link also have these homeplugs that you push ethernet via the electrical wirings that is supposed to manage 1gb. Is that solution still not as good as a coax...

@PeppeL OK, then forget about ISP router/modem brand and model. Not that important. It is an option to start with Deco mesh as in place replacement for Asus. That might be enough and if not, or if...

@PeppeL One more thing. If Asus Lyra mesh units have Ethernet backhaul and you like the idea of Ethernet over coax, I would suggest you add MoCA adapters first. Then, try Asus Lyra with Ethernet...

@PeppeL TV wiring is absolutely the option and it is as good option as Ethernet cable. It is superior to powerline. The technology is called MoCA. Here is general idea: You will need MoCA adapters,...