How can I reset ATT Fiber Router?
To find out how to reset ATT Fiber Router, you are supposed to follow and apply few important instructions. Like, first of all, you should press and hold the gateway reset button for at least 10 seconds. Now, if you let go before 10 seconds, the gateway will soon reboot bit surely it won’t reset. Now, you are supposed to wait until the gateway restarts and all the status lights are LIT and then if the broadband or service status lights are solid green, that means that the reset worked. By applying and executing the steps, you can simply find out the ways to resolve it.
https://connectrouter.com/how-to-reset-att-router/