To perform a clean install, you must create a bootable USB installer. You will need a USB flash drive with at least . Format the Drive: Open Disk Utility . Select your USB drive and click Erase . Format: Mac OS Extended (Journaled) . Scheme: GUID Partition Map . Name the drive: MyVolume . Use the Terminal:
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softwareupdate --fetch-full-installer --full-installer-version 10.13.6 Apple Support 2. Create a Bootable USB Installer To perform a clean install, you must create
: If you are on a Mac running macOS Catalina (10.15) or later, you can use the following command to download the full installer directly from Apple's servers: softwareupdate --fetch-full-installer --full-installer-version 10.13.6 Select your USB drive and click Erase