Download High Sierra from the the App Store and place a formatted USB drive named ‘Untitled’ and fire this command into the terminal. Enter your system password and let it run for several minutes.

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia —volume /Volumes/Untitled —applicationpath /Applications/Install\ macOS\ High\ Sierra.app

Tip: Press Ctrl+T to check progression.

Thanks to: Macworld

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