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Mac firmware revive and restore
In macOS 14 or later, you can also help users revive or restore a Mac from the Finder. Reviving or restoring firmware might also help if a Mac experiences a persistent macOS installation error not resolved by other solutions for macOS installation errors.
If you can’t start up a Mac with firmware issues
What to look for:
Starts up to an exclamation point in a circle.
Shows the status indicator light pattern for firmware recovery mode.
Turns on but starts up to a blank screen.
Note: There are also other causes and solutions for a blank screen.
Steps to take:
Review the Apple Support article How to revive or restore Mac firmware.
See alsoDiagnose Mac startup issues
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