Why macOS updates would possibly brick your Mac, and what you are able to do about it


Anecdotal studies 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 Assist Communities boards and Twitter, largely describing the identical signs: unresponsive Macs that may’t be revived utilizing the everyday SMC and NVRAM diagnostic catch-alls.

The studies rounded up by MacRumors point out a number of Intel Mac fashions, starting from the 2015 mannequin yr all the way in which as much as 2020, however do not point out Apple Silicon fashions—this makes some sense, since they replace a bit in another way than Intel Macs and will not be vulnerable to the identical issues.

We have requested Apple about these anecdotal studies to see if there are any points the corporate is conscious of or steering it has for folks 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 generally 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 reasonably than doing it individually (this additionally contains updates to the “bridgeOS” software program that runs on Apple T1 and T2 Macs). For PC homeowners, think about Home windows updates that might additionally replace your pc’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 help 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 besides and unable to be revived by means of the everyday 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.

Tips on how to 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 might 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 pc’s NVRAM does not do something, your subsequent finest wager is to get in contact with Apple, both on the telephone, through chat, or in an Apple Retailer. If the true underlying situation is your {hardware}, they’ll repair it (although it may cost a little you in case 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 obtainable, you might have an alternative choice. These Macs might be booted right into a “DFU” restoration mode, very like iOS units and Apple Silicon Macs. Utilizing Apple’s directions, you’ll be able to 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, it is best to be capable 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 might be recovered in an analogous method.

The draw back to a DFU restore is that it’ll completely wipe your Mac’s inside storage. If you happen to hold first rate backups, then it is well worth the trouble to get your pc working once more. If in case you have vitally necessary information saved in your Mac and nowhere else, or if the DFU restore does not work, then contacting Apple needs to be the next step.

One of the simplest ways 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 studies of issues or not. Apple’s safety updates for Catalina and Large Sur do typically embody the identical firmware updates that the brand new working system contains—that is vital for patching firmware-level safety vulnerabilities—so if the issue truly is precipitated 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 latest 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 a minimum of take away one variable from that equation.

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