If your Mac is a 2021 14-inch or 16-inch MacBook Pro with a motherboard replacement, it’s best not to upgrade to macOS Monterey 12.3. macOS Monterey 12.3 was released last week, and if your Mac has had a motherboard replacement, and it’s a 2021 14-inch, 16-inch MacBook Pro, the upgrade will brick your Mac and cause all kinds of errors.
According to the problems encountered by users on Apple’s official support forums and other social networks, there is a problem with macOS Monterey 12.3, which can cause Macs with replaced motherboards to encounter errors when upgrading, enter an infinite reboot loop, or directly brick, especially 14-inch and a 16-inch MacBook Pro.
If you upgrade macOS Monterey 12.3, you will encounter two kinds of errors, the first one is directly bricked and cannot be used, and the second one completes the upgrade and restarts, but the system is not upgraded successfully, and the iBoot Panic error message will also be displayed.
If the Mac does not boot after the upgrade, the user needs to enter DFU mode to make the Mac available again. To make matters more complicated, a second compatible Mac is required to make the bricked Mac available again. Even going to an Apple Store is useless because after replacing the motherboard it is still not upgradable and stuck in an endless loop of errors.
Some users have complained that they have tried various methods to upgrade, but all are ineffective. Including direct upgrades, installs via the App Store, recovery mode, DFU recovery, all failed. macOS Monterey versions prior to 12.3 can be installed and upgraded normally. Finally, the user chooses to download macOS 12.2 and install it.