Hello, I just set up my deco by replacing my first g3100 router. Everything was working and then all of a sudden all 3 deco went red. What may be the reason? How to reset these deco I can start over??

Hello, New to tp-link, Just wondering if I can replace my verizon G3100, internet only router with one of the X600 mesh device? I want to replace my current G3100 with one and use other two to extend