If you have an Xfinity Router and need to know how to factory reset Xfinity Router , first, locate the reset button. It is usually situated at the rear end of the router. Now, follow the steps mentioned below: Use a pointed object such as a paper clip to press and hold the reset button for 10 seconds. Release the reset button and you will notice that the status lights of the router flicker and the router restarts. Wait for the router to reboot completely. The factory reset of your Xfinity Router is completed successfully.