If your drive is already formatted, you can skip this section. Prepare the External Driveīefore you can create the installer, you need to format the drive. The next time you upgrade, you might want to make a backup of the previous version’s installer, just in case.įor this process, you’ll need a 16GB or larger USB flash drive or external hard drive. Moving forward, it’s worth remembering that older macOS versions are now harder to download.
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