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Using Disk Utility, included with the Internet Recovery option, you can erase and reformat the startup drive. This section covers the basics of erasing and reformatting the startup drive. Warning: This process will completely erase your Mac’s startup drive! It’s possible to use the normal Recovery volume, as long as it’s located on a different volume than your startup drive, but it is much easier to use Internet Recovery and not have to worry about the location, or the version of the Recovery volume. Use Apple’s Internet Recovery system to erase and reformat the APFS startup drive to an HFS+ formatted drive. Converting to HFS+ will completely erase the startup drive.
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The reason for mentioning APFS is because when you downgrade it may be worth converting your startup drive back to HFS+ to ensure compatibility during the install process.
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Sierra does have experimental support for APFS, but trying to use APFS with Sierra may not be advisable. It’s important to note that High Sierra can support APFS on SSDs but not Fusion or hard drives. APFS is currently only fully supported on all media types in Mojave.
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Mojave upgrades the startup drive to APFS, Apple’s new File System. One option is to use the DiskMaker X app and follow the instructions in Create a Bootable macOS High Sierra Install Drive with DiskMaker X. When you have the installer downloaded, make a bootable copy of the installer on a USB flash drive or other media.
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NB: High Sierra can currently be found in the Mac App Store using the link above, but Apple may choose to remove or restrict the download in the future. Once the installer has finished downloading, quit the installer which may start automatically. If you want to go back to an earlier version of the OS, you’ll need to have downloaded the installer before you upgraded to Mojave, or have access to a Mac running an earlier version of the operating system, and then log in to the App Store and download the installer you need using the store’s Purchased tab. You can find it using the direct link: /us/app/macos-high-sierra/id1246284741?mt=12 One of the most simple choices is downgrading to macOS High Sierra since the installer app is still available in Mojave’s Mac App Store.
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This will let you run earlier versions of apps that you may need, without having the need for a downgrade.