A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan.

A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage.

What you need to create a bootable installer You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time. These advanced steps are primarily for system administrators and others who are familiar with the command line. I recently worked on a MacBook Pro Retina 15' A1398.

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