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there are four supported methods of installing macOS High Sierra.

installations and updates cannot be done on external devices, like those connected via Target Disk Mode, Thunderbolt, USB, or Firewire.

the Mac being installed or updated must be connected to the internet.

It states the limitations to installing and upgrading macOS with High Sierra: The final nail in the coffin for imaging is this support article: Upgrade macOS on a Mac at your institution

Update : While most of the information in this post is still relevant, I wrote a new, updated post regarding the macOS 10.15 Catalina Upgrade here: “ Imaging is still dead“ The Final Nail Please check it out: “ macOS Installation for Apple Administrators“

I have written a book which expands on this topic and is regularly updated. With the release of macOS High Sierra, Apple has finally confirmed that imaging is dead.Īpple doesn’t recommend or support monolithic system imaging for macOS upgrades.

The writing has been on the wall for a long time.