![]() Open the Terminal application on Mac OS located in / Applications / Utilities /.Insert a USB flash drive into your Mac, rename the drive to HighSierra for easy identification – remember to format and remove the USB drive to become a High Sierra installer.Check that “Install macOS 10.13 Beta.app” is in the Mac Applications folder, here by default download.Creating a MacOS High Sierra Beta USB Drive ![]() This guide explains how to create a macOS 10.13 Beta installer with the current developer beta, but the same principles apply to public beta when it is also available. Mac App High Sierra Beta installer downloaded from the Mac App Store (direct link) and located in the / Applications / folder.USB flash drive (16GB or larger) that you don’t want formatted to become a High Sierra installer.
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