@Danny_W >if I connect to the first M4 that wired into the same switch I barely get above 300mbps even when standing right next to it. If I read this correctly, you are saying that wired connection...

@drew1998 I misunderstood your original post. I thought Deco units are connected to ISP router through networking switch, not directly. I can't help with ISP router configuration, sorry. Perhaps,...

drew1998 wrote @Alexandre. There is any way to make it work with an external switch ? @drew1998 Deco mesh works just fine with most unmanaged network switches, DLink brand is one notable exception,...

@drew1998 I recommend you run simple test: bring one of Satellite Decos to where Main Deco is, connect it by short Ethernet cable of good quality, even Cat5 is OK, to the second port of Main Deco,...

@WedweDoDo Perhaps, I was not clear with what I recommended. Maybe, this picture will help: Take WiFi Range Extender, as it is shown at the left of that picture. Configure it as you could regular...

@WedweDoDo If under signal you mean "WiFi signal," consider buying regular WiFi Range Extender. That might be enough for signal extension a your place. If you think this is not enough, get range...