Canon LBP7210Cdn Manual page 666

If the administrator password is not set
It is not required to enter any value in [Administrator Password].
"Setting and Changing the Administrator Password"
Select [Network] from the [Device Manager] menu.
Click [Update Firmware] under [Firmware].
Update the firmware.
(1) Click [Browse] to select the update file for the firmware or enter the path for the
saved update file.
(2) Click [Update].