How to Unlock the Audio System of an Old Audi A6?

[MacBrielle]

Methods to unlock the audio system of an old Audi A6: 1. Turn on the radio, and the display should show 'safe'; 2. Simultaneously press the AF or FM and SCAN buttons, and release them when '1000' appears on the display. Do not hold these buttons for too long or press them twice, otherwise '1000' will be entered as the password; 3. Use the first four preset tuning buttons to input the password provided by the owner. Use button 1 for the thousand-digit code, button 2 for the hundred-digit code; 4. After correctly entering the password, simultaneously press the AM or FM and SCAN buttons until 'safe' appears; 5. Release the AM or FM and SAFE buttons at the same time. Shortly after, the radio frequency should appear on the display, indicating that the audio system is unlocked and ready for normal operation.