@Ejazmp in the Tether App I suggest you try changing DHCP Settings to Off: -> More -> Advanced Settings -> DHCP Settings -> Off

The connection seems to be based on whether you were provided a model GFRG300 or not. If not then you can put the Deco directly to the "Fiber Jack". If yes then you need to set the GFRG300 to Bridge...

1.2.7 looks like the latest firmware version. If you reset the primary Deco I believe you need to reset the node Deco and then add it back to the mesh. To set up a new/hard/factory reset Deco unit...

@SteveMat Using the app's check for firmware updates failed tonight/this (very early) morning. I tried the reboot option in the app a couple of times but the LED didn't ever change colors, like it...

@yves_b Hmmm. Good question. I never thought to check. I believe it does. (I will definitely check next time the router gets a local IP). Thank you for pointing that out.

@SteveMat Really hard to say which side's hardware is at fault. And that is the exact reason that AT&T requires use of it's residential gateway. If there's ever a firmware update, then I try to...