I live in a place where the power grid goes out frequently. When the power goes out my Archer AX6000 routers are knocked offline. I often have to use my phone to get a WiFi connection. Is there a way

Unable to register my product. I have the S/N number from the bottom of the router and from the box with are the same. It says unable to find the serial number contact support.

Can't seem register my Deco M4R Ver 2.8. I've input the serial number and it won't recognize it. I was able to successfully register my TP-Link AX6000. i'm puzzled.