sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/USB --nointeraction
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Note: If your Mac is too new (2019+), High Sierra won’t run anyway — it lacks drivers. sudo /Applications/Install\ macOS\ High\ Sierra
: Having a physical rescue tool for Macs that refuse to boot or require disk repairs. MacSales.com Requirements and Preparation diskmaker x 7 for macos high sierra download