To perform a Calix router password reset, you must log into the router's web interface. First, connect to the router's Wi-Fi. In a web browser, go to 192.168.1.1 and log in with your admin credentials. The default username is admin, and the password is on the side of the router. From the settings, you can change the Wi-Fi password.
https://calxwifi.com/forgotten-your-calix-router-password-heres-how-to-reset-it/