There were three different security exploits. The first was rapping with a mallet to compress the springs and release the pins (similar concept to bumping). B

There were three different security exploits. The first was rapping with a mallet to compress the springs and release the pins (similar concept to bumping). But don't forget: "In another bypass, they insert a wire into a silicon cover for an LED light that blinks red when the user enters an invalid code. That wire can ground a contact on the circuit board behind the light that triggers a function intended to allow the door to be opened with a remote button, bypassing all its security measures." and "A third attack allows an insider to open the back side of the lock and insert a wire that flips a microswitch intended as an override for power failures. That trick resets the lock’s software, tampering with its audit trail and allowing it to be reprogrammed with different codes. Bluzmanis demonstrated in a video that the more elaborate microswitch attack could be performed in under a minute."