

In most cases, you will need to provide proof of ownership of the Mac which has a locked firmware password in order for them to unlock the computer in question. Again, even if your Mac is not on that list, you should contact them. You can contact the official Apple Support channels by phone, or schedule an appointment with a Genius Bar at a local Apple Store.

At the Utilities screen, go to the Utilities menu bar item and choose “Firmware Password Utility”.Reboot the Mac and hold down Command+R to enter recovery mode.

You may be able to reset, change, or disable the firmware password using the same method you used to set the password to begin with, this requires booting into Recovery Mode: 1: Try to Reset or Disable with Firmware Password Utility Using the the Apple ID approach on boot is typically the easiest for modern Macs. If the password you’re having trouble remembering is a general Mac login or administrator password, you can reset it with these instructions instead. The firmware password appears immediately upon boot and is a gray locked icon, looking like this: Do note that a firmware password is not the same as an administrator password or the general computer password used to login to a Mac.
