Apple Configurator User Guide
Revive or restore an Intel-based Mac using Apple Configurator
In very rare circumstances, such as a power failure during a macOS update or upgrade, a Mac may become unresponsive and so the firmware must be revived or restored.
For complete instructions on reviving or restoring your Mac, see the Apple Support article How to revive or restore Mac firmware. (You may want to update any bookmark you have for this content.)
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