0460266 keypad programming instructions - Locks & Locksmithing

Just throw it away and buy a new one from Sentry Safe. It is an unknown company with no Support.

https://www.google.com/search?q=hardline+electronic+digital+safe+manual

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there should be an access code maybe on the back of the device, if you have mounted it, remove it and inspect the back of it for code also check for code anywhere inside the the advertisement from package. if you bought it from a neighbor and it was opened, give it back,,,nice try

https://www.schlage.com/en/home/faq.html?keypad-programming-guide-user-guides

Instructions for an Electronic Digital Safe

1. Enter your code on the keypad located on the front of the safe. ...
2. Turn the handle to the right within five seconds of correctly entering the code. ...
3. Open the safe with a key. ...
4. Enter your code to open the safe.
5. Place the electronic digital safe into code reset mode. ...
6. Enter your new code on the keypad and press "#" to finish.

https://www.hunker.com/13419338/instructions-for-an-electronic-digital-safe

change battery, push reset button and reprogram

Any locksmith can do it,BUT- if you go to hardware store you can find locks that have a number on the front of the box that says something like 'TypeA, or Type B' If you purchase the same lock type with the same number or letter, they will all use the same keys included. It's much cheaper than a locksmith.

It might be your batteries are dying, or that someone has been tampering with it and messed up the combination. You can get the manual if you don't have it anymore by searching Google for "chamberlain whisper drive garage door opener change code". Page through the instructions and reset the motor control to erase all your remotes, put new batteries in the one on your wall and the one in your car if it's not the kind that's built into the car, and then follow the instructions to program new codes.