If you’re using a Mac with the Apple T2 Security Chip and you can’t start up from the bootable installer, make sure that Startup Security Utility is set to allow booting from external or removable media. Then click the onscreen arrow or press Return. Select the volume containing the bootable installer. Release the Option key when you see a dark screen showing your bootable volumes. Turn on your Mac, then immediately press and hold the Option (Alt) key. When the macOS installer opens, follow the onscreen installation instructions. Select the volume containing the bootable installer, then click Continue. Turn on the Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes. A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing. If not, the Mac may start up to a circle with a line through it. Remember that the Mac you’re starting up with the bootable installer must be compatible with the macOS on the bootable installer. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Use the bootable installerĭetermine whether you're using a Mac with Apple Silicon, then follow the appropriate steps. Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume El Capitan Sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume High Sierra Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Mojave Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Catalina Sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Big Sur Sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Monterey Sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Ventura If your Mac is using macOS Sierra or earlier, append -applicationpath to your command, followed by the appropriate installer path, similar to what is shown in the command below for El Capitan. Remember to replace MyVolume in the command with the name of your volume. You can now quit Terminal and eject the volume.ĭepending on which macOS you downloaded, enter one of the following commands in Terminal as instructed above. When Terminal says that it’s finished, the volume will have the same name as the installer you’ve downloaded, such as Install macOS Sonoma. Terminal shows the progress as the volume is erased.Īfter the volume has been erased, you may see an alert stating that Terminal would like to access files on a removable volume. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal doesn't show any characters as you type. When prompted, type your administrator password. If the volume has a different name, replace MyVolume in the command with the name of your volume. Type or paste one of the commands below Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Open Terminal, which is in the Utilities folder of your Applications folder. Enterprise administrators: download from Apple, not a locally hosted update server.ĭownload a macOS installer using the App Store or your browser Use Terminal to create the bootable installer Your Mac must also be compatible with the macOS that you’re downloading. To download a full installer, your Mac must be using macOS High Sierra or later, the latest version of macOS Sierra or the latest version of OS X El Capitan. What you need to create a bootable installerĪ USB flash drive or other secondary volume with at least 14GB of available storage, formatted as Mac OS Extended You don’t need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful if you want to install macOS on multiple computers without downloading the installer each time, or you’re unable to install a compatible macOS from the Finder or macOS Recovery. These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal.
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