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Apple has fixed a bug where macOS Monterey could brick a Mac with a T2 security chip

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Since the release of macOS Monterey, some Apple users have said that installing the update broke their computer. As Rene Ritchie reports, the cause of the problem was unknown to date. He received this statement from Apple citing an issue with the T2 security chip firmware (via 9to5Mac).

We have identified and fixed a firmware issue with the Apple T2 Security Chip that caused very few users to be unable to boot their Mac after updating MacOS. The updated firmware is now included in existing macOS updates. Users affected by this issue may contact Apple Support for assistance.

There are no details of the affected model, potentially vulnerable settings or configurations, or the sum of a small number of users. MacRumors was able to find tweets from at least nine MacBook, MacBook Pro, and iMac owners that the device didn’t boot after the update. It’s nice that they can ask Apple Support for help, but it’s also unclear if those people can keep the locked data on the affected device.

The T2 security chip has appeared on many Apple computers since it was introduced in 2018 (list here). According to Apple, software that has been updated to resolve this issue is included in existing macOS updates (some trackers point to updated versions). With BridgeOS 6.0 software running on T2 coming out today), you shouldn’t have any problems with any of these machines anymore.

Sources

1/ https://Google.com/

2/ https://www.theverge.com/2021/11/5/22765759/apple-macos-monterey-t2-security-brick-bug

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