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Hdiutil attach Downloads/ -noverify -nobrowse -mountpoint /Volumes/install_buildĪsr restore -source Downloads/Install\ macOS\ High\ Sierra.app/Contents/SharedSupport/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase Hdiutil create -o Downloads/HighSierra.cdr -size 7316m -layout SPUD -fs HFS+J Step 1 - Create a bootable macOS High Sierra ISO hdiutil attach Downloads/Install\ macOS\ High\ Sierra.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
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