While password cracking can be used maliciously, ethical hackers and security professionals use similar techniques to test and improve system security. Always ensure that any activities related to password cracking are legal and ethical, with explicit permission from the system or network owner.
If you bought a used unit advertised with JJOS, verify it is truly activated. If it asks for a password on the "Save" screen, the license has not been paid for. Warning on "Cracks" jjos password crack