If you have lost or forgotten the login password of your Xfinity Modem, you need to do a factory reset Xfinity Modem. Once the reset is complete, you can use the default password to log into the device’s admin console. Here’s how you can do it:
Turn on your Xfinity Modem and ensure that the power LED is lit.
Locate the reset button. Usually, it is situated at the rear end of the modem.
Press and hold the reset button for about 10 seconds and then release it.
You will notice that the status lights of the modem flicker and the router restarts.
The factory reset of the Xfinity Modem is complete.