Dell 1600n reset password

Dell has been no help in resolving this issue...

Have a Dell 1600n printer. Can access the basic settings for review
only using a web browser. However, any attempt to change settings
requests the password. The username is the default admin, but I have
no idea what the password is (I got stuck as the support person for
this printer - person who set the password is no longer here).

I've updated the firmware using a usb connection, but password remains.

Suggestions??

Kindly,
Ken