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Knowledgebase: Faronics Products > Deep Freeze
Problems with systems running macOS not booting after installing software updates.
Posted by Adam Zilliax on 31 January 2018 12:20 PM
During the installation of software updates some instances have been noted where the system in question is unable to boot and will show a screen with a prohibited sign after installing Apple Software updates. In some cases we are seeing systems having the boot volume converted to a Core Storage Volume after the installation of Apple Software Updates. On systems running Deep Freeze this results in the system being unable to boot as Deep Freeze cannot properly access or control Core Storage Volumes.

To resolve this issue;
  1. Shut down the machine completely.
  2. Boot the computer from the recovery partition by holding down COMMAND-R at boot time.
  3. After booting open the terminal by selecting the appropriate option from the utilities menu.
  4. Run the following command in the terminal;

    diskutil cs list

    In the output from the command you should see a line indicating;

    Logical Volume xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx

    Note down this long string of letters and numbers on your system
  5. Run the following command to revert the Core Storage Volume.

    diskutil cs revert xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx

    Replacing the "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx" with the combination of letters and numbers that you saw in step three.
  6. Reboot the system.

If you do not see an entry for your Logical Volume or you see the message "No Core Storage Logical Volume Groups Found" then the issue affecting your machine is likely unrelated to this issue and you will need to contact Faronics support to investigate further.
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