Macbook pro stuck in a restart loop installing update 2020-005

After a reboot, High Sierra is trying to install security update 2020-005, but immediately halts with "An error occurred while updating firmware. Quit the installer to restart your computer and try again" - then it does the whole thing again. How can I break out of this loop?

MacBook Pro 17″, macOS 10.13

Posted on Jan 31, 2021 1:02 PM

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1 reply

BDAqua

Level 10

250,253 points

Jan 31, 2021 2:56 PM in response to jrcardwell

Gulp, not a good sign at all, but try this before contacting Apple...

Start up from macOS Recovery

To start up from macOS Recovery, turn on your Mac and immediately press and hold ...

Command (⌘)-R

Installs the latest macOS that was installed on your Mac

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Macbook pro stuck in a restart loop installing update 2020-005

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