want to add a deco M5 to my existing network but my app doesnt show any network when i logged in. I don't want to restart everything from scratch as I already have 3 decos running smoothly for years.

I've been using my 2 M5s with my old fiber internet service provider (modem provided by ISP was Huawei Echolife) without issues. Unfortunately, when my wifi connection went bonkers and my ISP'ss techn