MacOS Update Installation Prohibitory Signage

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MacOS Update Installation Prohibitory Signage

August 7, 2018 Tech News Tips & Tricks 0

First of all, do you guys know how to pronounce Mojave? It’s pronounced as Mo·ha·ves, (especially collectively) Mo·ha·ve. It is a member of a North American Indian tribe belonging to the Yuman linguistic family, formerly located in the Colorado River valley of Arizona and California.

The latest MacOS is named after it now. During Beta update installation, you will be expecting to either get once a week or every fortnightly. Sometimes, you do see weird symbols appearing on your screen during installation. Well don’t panic, it’s Beta after all! (p/s it happens too sometimes with the non-beta stable version of OS update). Learn more about the different signage here.

One of them that we realized it’s widely searched it’s the one with prohibit sign.

What causes this?

  1. Corrupted update caused by intermittent network connectivity issue during download of the update
  2. Interrupted power supply during installation
  3. Hardware withstand heavy impact (collision or dropping to floor)


How to fix it (apart for #3 above, you might need to send back to Apple service center, the rest can be fixed)?

  1. Turn off your MacBook completely by holding on to the power button (force shut down)
  2. Turn on your MacBook again after 5 seconds
  3. When you hear the welcome tone, hold on to Cmd + R until you see MacOS utilities screen appear
  4. Select Reinstall MacOS or Restore From Time Machine Backup (if you search on some YouTube video tutorials, they will ask you do choose Disk Utility – it is not relevant)
  5. If you choose to Reinstall MacOS, be prepared to download the latest non-beta stable version of MacOS again
  6. If you choose to Restore From Time Machine Backup, select the restore point when prompted with the last known working date/time of your MacOS version

What’s Next?

  1. Once you are able to log in back to your MacOS either #5 or #6 above, remove any developer or public beta tester profile
  2. Go to System Preferences > Software Update
  3. Below the Software Update gear, click on Details
  4. Click on Restore Defaults when prompted
  5. Head over to and redownload the developer/public beta tester profile
  6. Restart your machine and proceed with usual update/installation

You can learn more about MacOS recovery here.


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