1) Unable access to the modem / router admin page.
2) Forgot login password for the router admin page.
1) Power on the SMC modem / router and wait until all the lights are light up.
2) Press and hold the reset button for 15 seconds and wait until all the lights are light up as the modem / router needs to reboot.
3) Try to access to the admin page again by default login IP – http://192.168.2.1/.
4) Enter the default login password.