I have a single deco that is malfunctioning. It was my main deco. It needed and update but couldn't update. It kept disconnecting from the internet. I switched it out with a different deco and was able to restore my network with 3 of the 4 decos. The one that was the main, has been reset and is flashing blue. But when I try to add to network, it can't find it. I've reset it multiple times. I've plugged it in directly to the router. Nothing. I don't have a way to directly connect to a computer. Any help??