Select Reinstall OS X and click on the Continue button.ġ. Quit Disk Utility and return to the Utility Menu. Click on the Apply button, then click on the Done button when it activates. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.). Click on the Erase tab in Disk Utility's main window. 
When Disk Utility loads select the drive (usually, the out-dented entry) from the side list. Select Disk Utility and click on the Continue button. The Utility Menu will appear in from 5-20 minutes. Immediately after the chime hold down the (Command-Option-R) keys until a globe appears. If possible backup your files before proceeding. Internet/Network Recovery of El Capitan or Later on a Clean Disk In the process, you will lose the boot block that enables the dual drive system. You will have to reformat the volume used for OS X then reinstall OS X. Then you have most likely formatted your OS X volume with Windows' format and erased OS X. Then, enter the firmware password to disable it. Terminal will not show any characters as you type it in. When prompted, type in your administrator password and hit Enter (Return). Log into an administrative user account, then open Terminal. If prompted, enter the firmware password to continue startup.Ģ. Boot macOS either by using the Boot macOS button in the Boot Camp Control Panel or by holding down the Option key while turning on or restarting your Mac. 
Click on Turn off, then enter your firmware password. Then, click on one of the following utilities:ģ. When the Utilities menu appears, go to the very top menu bar and click on Utilities. When prompted, enter the firmware password and hit Enter (Return) to continue startup.Ģ.
Boot Recovery Mode by holding down Command-R while you turn on or restart your Mac. Method A: Graphical User Interface (GUI) via Recovery Modeġ. If you know the firmware password, here's how to remove it: If you didn't set this password yourself, you'll need to contact the previous owner for the password or take your Mac to the nearest Apple Store (or Apple Authorized Service Provider) to get the firmware password removed. This password is not your login password for either macOS or Windows instead, it's a password to prevent startup modifications. It sounds like a firmware password has been set on your Mac.
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