HOW TO MAKE BOOTABLE USB MAC OS SIERRA UPGRADE
Then, just reboot the computer you want to reinstall or upgrade macOS on, hold the Option ( ⌥) key, select the drive you just created, and follow the installation steps.
It might take some time depending on the macOS version and the USB drive that you are using, but once it is complete, your new installer USB will be ready. Confirm that you are okay with all the data on the flash drive being erasedĪfter that, the process will begin.Also, remember to rename macOS\ Installer to whatever the actual name of your USB volume is. This is important because otherwise, the createinstallmedia application will interpret everything after the space character as a new command.
Remember that all spaces in the file name and the path (including the name of the USB drive's volume) need to have a backslash before them, like this: \. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS\ Installer -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.appįor OS X Yosemite and installers for other older versions of the operating system, use the same command as for OS X El Capitan, but replace all instances of Install\ OS\ X\ El\ Capitan with Install\ OS\ X\ Yosemite, or whatever the name of the OS X installer application is. Type everything else exactly as you see it (or better yet, copy and paste it from here).
HOW TO MAKE BOOTABLE USB MAC OS SIERRA INSTALL
(The name of the version of macOS, is the one you want to install on the key and downloaded.) Instead of '/Volumes/ MyVolume', type the name of your USB drive. Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS\ Installer -applicationpath /Applications/Install\ macOS\ Sierra.app In Terminal, type one of the following commands, depending on your version of macOS. Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/macOS\ Installer To copy the installation files to the USB drive and to make it bootable, first, you will need to copy the command that you will use, which will be different depending on your macOS version. With that, you now have all the pieces required for creating a macOS installer USB. You can either just download the latest version of macOS High Sierra, or, if you've downloaded older versions before, find previous versions of macOS, which would be listed and available for download under the 'Purchased' tab in the Mac App Store. Next, you need to download a macOS installer from the Mac App Store. Select Mac OS Extended (Journaled) as the file system, and choose GUID Partition Map if asked.