Locate the reset button on the back or bottom of the Xfinity modem
Use a paperclip or pin to press and hold the reset button for about 15 seconds
Release the button when the lights begin to flash or the modem restarts
Wait several minutes for the modem to fully reboot and reconnect
If needed, unplug the modem’s power cord for 30 seconds, then plug it back in
If the modem still does not work, contact Xfinity support