Press "START" and "HOME" and hold both buttons for 3 seconds.
1. "PIN1" will be displayed on the screen.
2. Enter the old PIN code by using the "START" and "HOME" buttons to select and "OK" to confirm each digit.
3. Once the old PIN code has been entered, "PIN 2" will be displayed on the screen.
4. Enter the new PIN code in the same way as the old one.
5. Once the new PIN code has been entered and "IDLE" is displayed on the screen, it is saved.