On another device, go to an unlock tool site such as BIOS Master Password Generator or BIOS Spark. Enter your challenge code to generate an unlock key.
Resetting the BIOS password is essential if you have forgotten it or if someone has set a password without your knowledge. If you can't access your computer due to a BIOS password, you won't be able to:
Restart your EliteBook and enter the generated exactly as shown.
Are you able to by entering the password incorrectly three times? EliteBook 840 G3 BIOS Password - HP Support Community
If the system provides a "System Disabled" code after three failed attempts, you may be able to use a backdoor generator. Enter the wrong password three times to trigger the System Disabled Note the code displayed (e.g., an 8-digit number). Use a tool like
Q: Can I use a BIOS password reset tool for other HP models? A: No, BIOS password reset tools are model-specific. Use a tool specifically designed for your HP model.