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Mac computers equipped with a T2 chip have an added feature called secure boot. It prevents unsigned operating systems from running on your Mac. Secure Boot helps protect against bootkits, or malware that infects the master boot record (MBR) on your computer. While it is safest to not change these options, if you plan on installing an older operating system such as macOS Sierra and earlier or run operating systems that are unsigned such as some distributions of Linux, you may need to disable secure boot to be able to run these needed operating systems. This wikiHow will show you how to disable secure boot on Mac so you can boot a legacy version of Windows or macOS or an operating system that does not support secure boot.[1]
Quick Steps
- Boot up or restart your Mac.
- Press and hold Command + R when you see the Apple logo.
- Log in to an Administrative account.
- Select Utility > Startup Security Utility.
- Enter your macOS password.
- Select No Security.
- Select Allow booting from external or removable media.
Steps
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1Boot up or restart your Mac. You can only access the Startup Security Utility while your Mac is booting up. If your Mac is powered on, go ahead and restart it. If it is powered off, go ahead and boot it up.
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Immediately press and hold ⌘ Command+R. Do so as soon as you see the Apple logo. Your Mac will boot into the macOS Recovery.Advertisement
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3Log in to an administrative user account. You will be asked to select a user account. Select a user with administrative privileges and enter the password for that account. Then click Next.
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Open Startup Security Utility. Use the following steps to do so:
- Click Utilities.
- Click Startup Security Utility.
- Click Enter macOS password.
- Choose an Administrative account.
- Enter the password for that account.
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Choose "No security". This will disable secure boot and does not enforce any security measures for bootable operating systems.
- Alternatively, you can choose "Medium security" which allows for pre-signed operating systems to run. This allows you to boot from any operating system that has ever been trusted by Apple, including previous versions of macOS.
- The default "Full security" option requires signatures from Apple to run. This will require an internet connection at installation time.
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6Set your allowed boot media preference. By default, the Startup Security Utility does not allow you to boot from an external drive. If you need to boot from an external drive (i.e. to install another operating system, a previous version of macOS, or repair macOS), click the radio option next to "Allow booting from external or removable media." It's the second option at the bottom.
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Restart your Mac. From the Apple menu, choose "Restart". You should now be able to run legacy versions of operating systems.
- If you have trouble, then make sure that there is no firmware password and that you are an administrator on your Mac.
Community Q&A
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QuestionHow do I check if it is enabled or disabled via Terminal Command?AasimTop AnswererUnfortunately, you cannot check the status of Secure Boot with Terminal or Command Prompt. Because Secure Boot is a firmware setting that you have to change in the Mac recovery environment, you need to boot into the recovery environment to view that setting.
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QuestionWhy can't I log in after turning off secure boot?AasimTop AnswererOn newer operating systems, including Windows 10, secure boot is mandatory, and the operating system will not start if it is disabled.
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Tips
Warnings
- Under normal circumstances, you should not turn off Secure Boot. This makes your computer more vulnerable to rootkits or bootkits.Thanks