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 10 to 15 seconds
Release the button when the lights on the modem start to change or blink
Wait for the modem to restart and fully reconnect
If needed, unplug the modem’s power cord for 30 seconds, then plug it back in
Wait several minutes for the modem to finish rebooting
Log in to the modem settings if you need to perform a factory reset from the admin page
Select the factory reset option and confirm the reset
Reconnect your devices to the modem after the reset is complete