Apple has fixed an issue that could cause some Intel Macs with a T2 chip to no longer boot up after installing macOS Monterey, the Cupertino firm in a statement. An issue with the T2 security chip firmware prevented some Mac users from being able to start their machines after updating to macOS Monterey.
Apple is now including a BridgeOS firmware update with the existing macOS updates to prevent further failures. Users already impacted by the issue should contact Apple Support for assistance with their machines.
Multiple users found their Macs bricked after updating. Affected users could not turn their Macs on, an issue that affected models with a T2 security chip that controls Touch ID and other security measures. Macs with M-series Apple Silicon-based chips were not affected as they do not have a separate T2 chip.
Macs with a T2 chip were manufactured between 2017 and 2020, with a list available below.