Sometimes rebooting the router does not help to resolve the issue you are facing and you need to reset it. The following is a method of how to reset ATT Uverse router. Follow the steps mentioned below.
Steps to reset ATT router:
Press and hold the reset button on the gateway for 10 seconds.
Make sure you hold it otherwise the router will reboot and nor perform a reset.
Wait till the status lights are on.
If the broadband or the service status light turns green, the ATT Uverse router reset is successfully completed.