This article has been indexed from MacRumors: Mac News and Rumors – Front Page
The latest macOS Monterey update, released to the public this week, is bricking Macs that have had their logic boards replaced, causing panic among customers who are unable to get their Mac back to a working state, according to a cluster of user reports posted on social media and Apple’s support forums.
Apple this week released macOS Monterey 12.3, which among other things, brought Universal Control to users. Sadly, not all users are being able to experience Universal Control or the latest update at all.
As chronicled on an Apple Developer forum thread, users who attempt to update their Mac to macOS 12.3 from macOS 12.2.1 or earlier are met with errors, endless restart loops, and possibly a completely bricked Mac. The reports are limited to just Macs that have had their logic boards replaced, specifically new 14-inch and 16-inch MacBook Pros.
There is a firmware bug in Mac OS 12.3 that renders the update impossible to install on any 2021 14 or 16 inch MacBook Pro that has had it’s logic board replaced.
The cycle is:
You try to upgrade, the upgrade will fail but recovery to handle it correctly, you’ll reboot still on 12.2.1 but with a report a problem dialogue informing you of an iBoot Panic
You’ll try to upgrade again. This time, the iBoot FW will corrupt. You’ll see the apple icon flash on boot 5-6 times before seeing the exclamation mark symbol telling you recovery is needed.
You can try and revive using a second Mac with Apple Configurator 2. This will fail, because it tries to load the 12.3 firmware from the IPSW, in either DFU or Recovery mode.
The only way to get things running again is to manually download the 12.2.1 IPSW and use Apple Configurator 2, with the Mac in DFU mode, to load the revive image. This will update the firmware of iBoot, and the recovery image to a working build. The Mac will then restore 12.2.1’s OS, keeping your data upon finishing.
According to the reports, there are two possible outcomes users are facing. Either a Mac becomes completely bricked and un
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Read the original article: macOS Monterey 12.3 Update Bricking Macs That Have Had Logic Board Replacements