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Troubleshooting OS update and installation issues on Macs

1. OS cannot be reinstalled on erased macOS devices


OS cannot be installed back on macOS devices after a device wipe.


You may have to install or reinstall the same OS version from scratch to resolve this issue.

Step 1: Boot to the Recovery HD

Restart the Mac, and after the chime, long-press the command + R keys until the menu screen appears. Else, long-press the option key until the boot manager screen appears. Then, choose Recovery HD and click on the corresponding arrow button.

Step 2: Erase the Hard Drive

  1. Select Disk Utility in the macOS Utilities window and click Continue.
  2. Select the startup volume (generally Macintosh HD) from the Disk Utility left panel. Then click on Erase in the main window.
  3. Input a partition name and set the partition format as Mac OS Extended (Journaled).
  4. Click on Erase in the pop-up window.
  5. Close the Disk Utility window and go back to the macOS Utilities menu.

Step 3: Reinstall macOS

On the macOS Utilities window, choose Reinstall macOS and proceed with the installation.


  • An active internet connection is mandatory for OS installation.
  • The OS version you are installing now should be the same as the one before the wipe.

  • Troubleshooting Guides