520:
Press SETUP on the keypad
Go to Option 2 for Region
Use the arrow keys to scroll down to access code and choose enable
Go to the next option to set up your access code. The default PW is 0000.
570/770:
Press The admin menu on the bottom left corner
Enter the admin password. The default is 0000.
Select option 1: Date/Time/Units/Password/Volume
Press right to go to page 2
Select ‘Set Passwords’
