Try using the buttons on the front of the Casanova verses using the remote. You first have to push the Set-Up button. The LCD screen will then prompt you to enter the password. Enter the password using the numbered buttons directly below the LCD screen. You'll know if the override password took when the LCD screen changes showing IMP, GLOBAL, MACROS, PW, and DAC CONFIG.
Password reset on Theta Casanova?
Is there a way to reset the password (without knowing the password) on a Casanova?