Electronic Locks - Digital Safe Locks - Combo Change . We provide high security safe locks.br br The first rule of changing an electronic safe combination is "Lock the Door Open", Push 74*, then type in the existing combination, and then push the pound sign. The lock will beep 5 times. Then push 1*, type in the new combination, then push the pound sign, the lock will beep 3 times. Repeat your new combination, then push pound, the lock will beep three times, then you're all set. Test out your new combination and you should be good to go.