To protect the data on your Mac, you can set a user account password (login password) to prevent unauthorized users from logging in to your user account. You can also encrypt your startup disk using FileVault, so that only users who can log in to your Mac can read the data on that disk.
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For even more protection, you can set a firmware password. A firmware password prevents users who don't have the password from starting up from any disk other than the designated startup disk. As a result, it prevents using some startup key combinations.
How To Bypass Firmware Password Mac
Jun 10, 2015 Remember to set the Mac up like new and register the Mac with a new iCloud account to avoid any future lock-downs. Option A: You can assume that a firmware lock was never set and brute force the firmware lock with a HID device such as a Teensy. This operation can take quite a while because it has to go through 10,000 iterations of possible pass. However, for even more protection, you can set up a firmware password on your machine. Just boot up from the OS X Installer CD and go to Utilities Firmware Password Utility and set a firmware.
The following steps apply to OS X Mountain Lion or later.
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How to turn on a firmware password
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Your Mac asks for the firmware password only when attempting to start up from a storage device other than the one selected in Startup Disk preferences, or when starting up from macOS Recovery. Enter the firmware password when you see the lock icon and password field:
How to turn off a firmware password
How to set a passcode for one-time use
You can also use the Lost Mode feature of Find My Mac to remotely lock your Mac with a passcode for one-time use. Your Mac receives the lock instruction from iCloud, restarts, and asks for the system lock PIN code you created. When you enter that passcode, the Mac starts up from your designated startup disk and disables the passcode.
Lost Mode works even while using a firmware password. Unlike the passcode set by Lost Mode, a firmware password remains on until you turn it off with Firmware Password Utility or Startup Security Utility.
Macbook Air Firmware Password HackIf you forgot your firmware passwordMacbook Air Firmware Password Hack
If you can't remember your firmware password or passcode, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.
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