To change the PIN on a safe at default mode, start with default PIN 1234, hold down the * button till underscore (_) shows up on the screen. Quickly enter new PIN and only push the * star button, (do not hold). Underscore (_) shows up again, quickly enter NEW PIN once again, and push *to confirm change.
So you hold down the * button only the first time to initialize the change. You push the * button to confirm the change second and third time.
The trick is only the first time after punching 1234 we have to hold down * button. AND only push * button briefly for the following 2 times after we enter new code and confirm it.