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From a shutdown state, double-press and hold the power button to boot into Fallback recovery OS. However, it won’t allow you to change the system security state - which most of us probably shouldn’t mess with anyway. It’s the same process as recoveryOS boot, except that it boots to a second copy of recoveryOS that, in Apple’s words, “is kept for resiliency.” If macOS Recovery Mode didn’t solve your problems, you can give “Fallback recovery OS” a try. Choose “Apple menu () > Startup Disk.” To quit the app, choose Startup Disk > Quit Startup Disk. Startup Disk: Set the startup disk for the Mac.In the Recovery app, choose “Utilities > Share Disk.” Share Disk: Share the disk of a Mac that’s started up in macOS Recovery.To return to the Recovery app, choose “Terminal > Quit Terminal.” In the Recovery app window, choose Utilities > Terminal.

Terminal: Change settings via the command line.To return to the Recovery app, choose “Startup Security Utility > Quit Startup Security Utility.” In the Recovery app, choose Utilities > Startup Security Utility. Startup Security Utility: Set the security procedures for your Mac.To return to the Recovery app, choose “Disk Utility > Quit Disk Utility.” Use this one with care! In the Recovery app window, select Disk Utility, then click Continue. Disk Utility: Repair or erase your disk.Note that Safari browser plug-ins and extensions are disabled in macOS Recovery. To return to the Recovery app, choose “Safari > Quit Safari.” If you’re connected to the internet, you can use Safari to search for more information on the Apple Support website. Safari: In the Recovery app window, select Safari, then click Continue.Boot your Mac holding COMMAND + R keys until you see the following screen below.Finally, recovery mode allows you to easily install the latest version of Mac OS X compatible on your Mac from the Internet. Booting into recovery mode allows you to use Disk Utility and repair your primary Mac partition for disk issues (by default, you cannot repair your primary Mac OS X volume while you are booted into it, this feature is greyed out in Disk Utility). Mac OS X recovery mode is useful for troubleshooting issues with your Mac computer. Ensure you are running the latest version of Mac OS X supported for your Mac machine in order to be able to access Recovery Mode. If your Mac does not have the built in recovery mode, you can attempt to boot into recovery mode over the Internet (see below). Today’s Mac computers have a built in feature called recovery mode which allows you to start your Mac computer on a separate boot partition on your hard drive and restore from Time Machine backup, reinstall Mac OS, or use disk utility.