Steps to make a Bootable ISO image from macOS 10.13 High Sierra installer on Mac

Steps to make a Bootable ISO image from macOS 10.13 High Sierra installer on Mac
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With screenshots, the following guide will show you how to create a Bootable ISO disk from macOS 10.13.x High Sierra installer on Mac.

DOWNLOAD
Download latest Install MacOS High Sierra.app from Apple store: https://itunes.apple.com/us/app/macos-high-sierra/id1246284741?mt=12

If at the time you reach this topic, High Sierra is not available to download from Apple Store, just download MacOS 10.13.1 High Sierra.app from here. However, You should make sure you copy the Install macOS High Sierra.app into /Applications/.

CREATING A HIGH SIERRA ISO IMAGE USING TERMINAL

  • Launch Terminal (Found under /Applications/Utilities/)
  • Enter the following command lines in order (Administrator password will be asked during the process).

hdiutil create -o /tmp/HighSierra.cdr -size 5200m -layout SPUD -fs HFS+J

hdiutil attach /tmp/HighSierra.cdr.dmg -noverify -mountpoint /Volumes/install_build

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build

mv /tmp/HighSierra.cdr.dmg ~/Desktop/InstallSystem.dmg

hdiutil detach /Volumes/Install\ macOS\ High\ Sierra

hdiutil convert ~/Desktop/InstallSystem.dmg -format UDTO -o ~/Desktop/HighSierra.iso

At the end, we get High Sierra.iso.cdr file on the Desktop.

Rename the files by removing the “.cdr”, we have just made Bootable ISO image from macOS 10.13 High Sierra installer, which can be used to create bootable USBs, DVDs, install VMs.
This exact ISO File was uploaded and is shared through this topic.