Press "7" then "4" and the "*" (asterisk) button.
Enter your six-digit master code using the number buttons and press "#." The lock will chirp five times.
Press "1" then "*" (asterisk), enter a new six-digit master code and press "#." The lock chirps three times.
Re-enter the new code a second time and press "#." The safe chirps three times once again, confirming the new code. Your combination is changed.
Enter your existing six-digit code, and the safe will chirp twice. Open the safe door.
Enter six zeros ("000000") into the keypad followed by your existing code a second time.
Enter a new six-digit code twice, one after the other. Your new code works immediately.