Why macOS updates might brick your Mac, and what you can do about it



Anecdotal reviews from over the weekend point out that the macOS Monterey replace could also be bricking some Macs throughout set up, leaving the machines unresponsive. MacRumors has rounded up a consultant swath of complaints from the Apple Help Communities boards and Twitter, largely describing the identical signs: unresponsive Macs that may’t be revived utilizing the standard SMC and NVRAM diagnostic catch-alls.

The reviews rounded up by MacRumors point out a number of Intel Mac fashions, starting from the 2015 mannequin 12 months all the best way as much as 2020, however do not point out Apple Silicon fashions—this makes some sense, since they replace a bit in a different way than Intel Macs and is probably not prone to the identical issues.

We have requested Apple about these anecdotal reviews to see if there are any points the corporate is conscious of or steering it has for individuals whose {hardware} stops responding to enter after a software program replace. We even have our personal suggestions, in addition to some hypotheses about why these main updates typically appear to trigger a higher-than-usual variety of {hardware} issues.

macOS updates aren’t simply updating macOS

When Apple releases new macOS updates, you are not simply getting updates to the working system. Since 2015 or so, Apple has additionally distributed most firmware updates as a part of the working system relatively than doing it individually (this additionally consists of updates to the “bridgeOS” software program that runs on Apple T1 and T2 Macs). For PC house owners, think about Home windows updates that would additionally replace your laptop’s BIOS or graphics firmware.

This protects steps for finish customers, who get the advantages of firmware-level safety and have patches simply by conserving their software program updated. Apple’s firmware patches include mitigation for hardware-level vulnerabilities like Spectre, Meltdown, and their ilk, and Apple additionally issued up to date firmware with macOS Excessive Sierra so as to add APFS boot assist to older Macs.

However bundling in firmware updates additionally provides complexity. In case your Mac is unplugged or runs out of battery throughout a firmware replace, which may render it unable as well and unable to be revived by way of the standard strategies. And since they’re extra intensive and take longer than a typical software program replace, each firmware updates and main OS updates can often unearth underlying {hardware} points with RAM, storage, or different elements.

How one can repair (and attempt to keep away from) these issues

Apple T2 and Apple Silicon-based Macs can be put into DFU mode and have their firmware restored by a second Mac running Apple Configurator 2.

Apple T2 and Apple Silicon-based Macs will be put into DFU mode and have their firmware restored by a second Mac working Apple Configurator 2.


If you happen to’re utilizing an older Intel Mac with out an Apple T2 chip in it (most Macs shipped previous to 2018), and resetting your SMC and your laptop’s NVRAM would not do something, your subsequent greatest guess is to get in contact with Apple, both on the telephone, by way of chat, or in an Apple Retailer. If the actual underlying situation is your {hardware}, they will repair it (although it may cost a little you should you’re out of guarantee). In any other case, they’re going to have extra instruments at their disposal to diagnose and revive your machine.

If you happen to’re utilizing an Apple T2 and you’ve got one other Mac out there, you could have another choice. These Macs will be booted right into a “DFU” restoration mode, very like iOS units and Apple Silicon Macs. Utilizing Apple’s directions, you possibly can join your “bricked” Mac right into a second Mac with a USB or Thunderbolt cable and use the Apple Configurator app to revive its firmware. If the Mac is bootable as soon as its firmware is restored, you need to have the ability to use Web Restoration or a USB set up drive to get a clear set up of macOS up and working on the system. Apple Silicon Macs will be recovered in an analogous method.

The draw back to a DFU restore is that it’s going to completely wipe your Mac’s inside storage. If you happen to preserve respectable backups, then it is definitely worth the trouble to get your laptop working once more. If in case you have vitally necessary information saved in your Mac and nowhere else, or if the DFU restore would not work, then contacting Apple must be the next step.

The easiest way to keep away from issues is to not replace your Mac till Apple has launched a few main bugfix updates for Monterey, which is often good to do with any new software program launch, whether or not there are widespread reviews of issues or not. Apple’s safety updates for Catalina and Large Sur do usually embody the identical firmware updates that the brand new working system consists of—that is obligatory for patching firmware-level safety vulnerabilities—so if the issue really is triggered or uncovered by the brand new firmware updates, avoiding Monterey may not assist. However assuming that the issues are being brought on by some mixture of recent firmware updates, hidden underlying {hardware} points with particular person Macs, and a brand new main OS replace, staying on Large Sur or Catalina for a pair extra months can no less than take away one variable from that equation.