Motorola MT7711 User Manual page 70

You will need to enter the Current Username and Password, and then the
new Username and Password. Your new Password will have to be entered
twice. Both the Username and Password fields accept entries up to 15
characters long. Both Username and Password may include lower- and
upper-case letters (a – z, A – Z) and numbers (0 – 9). Special characters are
not allowed. Be sure to click Save to write your changes to memory.
Caution: Once you make this change, you will not be able to log into the
modem if you forget the new Username and Password . To recover, you will
have to reset the modem to factory defaults. When you reset the device to
factory defaults, you will lose all changes you have made to the modem.
70