So I tried just about everything in the book when hooking up these deco units. I've factory reset I don't know how many times, and tried switching main units but whenever I setup the units I get to configure the WiFi and then the light goes red. However, when I hook it up to my old router thats connected to the modem it works fine and I get a green light... But when its connected directly to the modem I get a red light.. I've updated it to the recent firmware.