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Question

macOS Sierra Update 10.12.4 issue and fix

  • March 29, 2017
  • 59 replies
  • 316 views

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59 replies

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  • New Contributor
  • May 15, 2017

Has anyone had any luck updating from 10.12.3 to 10.12.5 without the device being stuck in the reboot loop?


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  • Valued Contributor
  • May 15, 2017

10.12.5 has fixed the issue for us. I booted from an external bootable drive and installed the 10.12.5 combo updater. The computer to a LONG time at the boot progress screen, but eventually logged in as the user just fine.


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  • New Contributor
  • May 16, 2017

@mbezzo When you updated to 10.12.5 were you computers on 10.12.3? Can you elaborate on combo updater please?


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  • New Contributor
  • May 16, 2017

@mbezzo answered my own question, nvm.


  • May 18, 2017

2016 15" MBP w/ TB worked fine for 3 months before 10.12.4. After a clean install of either 10.12.4 or even 10.12.5, it still will enter a startup loop after a few normal restarts. I've resorted to using 10.12.2 for now until a definitive fix arrives.

I always have FileVault turned on.
I don't use any Belkin adapter.
I've never noticed an issue with the date going to the year 2040, etc.

AppleCare knows about the issue but wouldn't provide their in-house tracking number regarding it; don't think it's a Campaign as of yet, since they have no published fix so far.


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  • New Contributor
  • May 18, 2017

Hi everyone, it sucks to have an update causing the boot loop issue, but good to see that I'm not alone. From my understanding jamf is a website for IT professionals but I'm not one. I saw mbezzo mentioned installing 10.12.5 from an external bootable drive to fix the issue. I would like to know if anyone has luck fixing the 10.12.4 boot loop by installing 10.12.5 update from the App Store? Thanks!


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  • Honored Contributor
  • May 18, 2017

@knnuui the only thing that worked consistently for me was the same thing suggested by @YoshiiZee

1.) Boot into single user mode
Run the commands:
mount -uw /
kextcache -u /
exit

2.) As it continues to boot, it will look like it's stuck but it isn't. Just wait a while and it will eventually reach the login

3.) Disable File Vault encryption and let it completely decrypt

4.) Re-enable FV

Sometimes booting to something else and fixing time would work for a bit but not always. Also booting from an external drive and trying to install the combo update for 10.12.5 to the regular boot drive would not work. Once the update had finished running it would just be back into the reboot cycle.


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10.12.5 update worked on my first test machine so far. I used the App Store update to go from 10.12.3 to 10.12.5. This one machine I had tried to go to 10.12.4 but kept getting the time bug, so I wiped and reinstalled 10.12.3 and kept it at that version until today. I'm glad to have this issue resolved.


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  • New Contributor
  • May 20, 2017

@Jeffery_Anderson Good to know!