If it is an official Master Lock, Master Lock Company LLC allows you to submit a lost combination form. To do this, you will need to have an available serial number. Master Lock Company LLC cannot provide combinations for non-serialized locks. Without a serial number, we will need to dig into some steps required to pick your lock.. Open shutter door to reveal the dials and the release button ; Rotate dials to the current combination (if the lock is new, the combination is set at the factory to 0-0-0-0) Press down on the release button to open the door ; Pull the door fully open ; Add or remove keys; Close compartment door
![[275] Master Lock 140D How To Open Any In Seconds!](https://i.ytimg.com/vi/u0chjaZGY9o/maxresdefault.jpg "[275] Master Lock 140D How To Open Any In Seconds! YouTube")
![[30] Another Way to Open Master Lock Combination Lock YouTube](https://i.ytimg.com/vi/ggDWl3uTGG0/maxresdefault.jpg "[30] Another Way to Open Master Lock Combination Lock YouTube")
Quick Start - How to Remove the Shackle of your 5440D Lock Box using the App. Once you have downloaded the Master Lock Vault Home app and registered your lock box, press any button on the lock box key pad to wake your lock box. In the app, touch the "Remove Shackle" button on the Lock Details page, which is found under "Manage Lock".. This is a sample video on how to actually open a Master Lock box. Even with instructions people manage to have a hard time opening it. This video should solv.