Switching service providers from cable to fiber. Box on the wall, fiber in, ethernet out. They ran that to a standard Zyxel wifi router they provided. I'd like to skip their router, instead of disabling it and running through it. I have the ID and password that the Zyxel uses to talk to my ISP. If I plug my main Deco directly into the fiber box's ethernet port, though, I just get yellow light no interent. It never asks for the authentification.

How do I get my Decos to go back to configuring? And is there a way to back up the current config?