You write a script that sends each potential password as a sequence of SysEx messages, then checks the MPC's screen for a "Success" vs "Fail" response. This is technically a "crack" but impractical for complex passwords.
: On the save screen, use the pads or data wheel to enter your purchased code. If you encounter issues typing it, ensure you are in the correct naming/entry mode. 3. Alternative: Free JJOS If you do not wish to pay for a license, the jjos password crack