SafeGuard Disk Encryption for Mac: How to restore Mac OS X 10.7 (Lion) after SafeGuard Disk Encryption for Mac 5.50.1 has been installed on this unsupported operating system.

  • Article ID: 113902
  • Updated: 21 Jul 2011

Issue
How to restore Mac OS X 10.7 (Lion) after SafeGuard Disk Encryption for Mac 5.50.1 has been installed on Mac OS X 10.7, which is an unsupported operating system.
Please also refer to the knowledgebase article: Advisory: If you install SafeGuard Disk Encryption for Mac 5.50.1 on Mac OS X 10.7 (Lion), Mac OS X 10.7 will no longer start.

Known to apply to the following Sophos product(s) and version(s)

Sophos SafeGuard Disk Encryption for Mac 5.50.1
Sophos SafeGuard Disk Encryption for Mac 5.50.0

Operating systems
All supported Operating Systems

Background
This is what happens if you install SafeGuard Disk Encryption for Mac 5.50.1 on Mac OS X 10.7 which is an unsupported operating system:

  • The SafeGuard Disk Encryption for Mac installation proceeds without any error messages
  • The required reboot is done
  • The kernel and partitions cannot be created, but no error message is displayed to the user
  • The installer exits due to this error and the Mac OS boot is started
  • The Mac OS boots as normally and the user can login
  • During bootup, the last step of the SafeGuard Disk Encryption for Mac installation is done in the background which selects the POA (Power-on Authentication) kernel partition to be default boot device on next boot. However, the POA kernel does not exist, so instead, it selects the LION Recovery HD as the default boot device.
  • This causes the Recovery OS to be booted instead of what is expected, i.e. the Lion OS.

What to do

  1. Boot the computer from the LION Recovery HD (if not already booted) and wait until the “Mac OS X Utilities” window appears.
  2. Quit Mac OS X Utilities and a dialog appears with the question:

    Are you sure you want to quit Mac OS X Utilities?

  3. Select the 'Choose Startup Disk' button to continue.
  4. The “Startup Disk” utility is started as usual from the OS X | System Preferences | Startup Disk
  5. From the available bootable disks select the internal disk with “Mac OS X, 10.7”
  6. Press the “Restart” button and then confirm by pressing the “Restart” button from the next dialog which is displayed:

    ..OS X Lion is now booting ..

  7. SafeGuard Disk Encryption for Mac is still installed but cannot be used
  8. When trying to start the SafeGuard GUI the following message is shown:

    Could not mount kernel partition

  9. You cannot use the SafeGuard uninstaller in this scenario. You will need to use the Purge un-installer to remove the SafeGuard Disk Encryption for Mac components (The Purge un-installer can be requested via technical support).

 
If you need more information or guidance, then please contact technical support.

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