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macOS USB install.md

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macOS USB install

Create USB installation drive

  1. Download macOS from the Mac App Store; then quit the installer (from its menu).
  2. Mount your USB drive.
  3. sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia—volume /Volumes/macinstall

Reinstall macOS from USB

  1. Restart the Mac, holding down the Option key (or Cmd+R). Startup Manager will load.
  2. Setup Wifi.
  3. Choose Disk Utility and erase the Macintosh HD drive, use APFS (not APFS (Encrypted) - can turn on FileVault later).
  4. Reinstall macOS