Enter the following command syntax at the command line, replacing “UNTITLED” with your USB drive name if necessary:.Open the “Terminal” application found in /Applications/Utilities/ directory on the Mac.When the installer has completed downloading, it will automatically launch – quit out of the installer when this occurs.Download macOS High Sierra installer application from the App Store* and be sure the complete installer is located in the /Applications/ directory.Connect the USB flash drive to the Mac, if you need to format it go ahead and do so.
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How to Make a Bootable USB Installer for macOS High Sierra
Making a USB install drive requires the usage of precise syntax at the command line with superuser privileges, using the wrong syntax could lead to unintended data loss.