Whether you can reset a padlock depends entirely on the specific model. For most resettable combination padlocks, you cannot reset the code if the lock is currently closed and the combination is unknown; this is a core security feature to prevent unauthorized access. However, if the lock is open, most models allow a reset by rotating the shackle 90 or 180 degrees and pressing it down while setting new numbers. For certain high-end brands like Master Lock, some models have a "serial number" that allow authorized locksmiths to retrieve a factory-set recovery code, though this service often requires proof of purchase. If the lock is a standard, non-resettable fixed-combination model, there is no "reset" function, and the lock must be bypassed or discarded if the code is lost.