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      BIOS update process will not be complete if the BIOS item "RTC Alarm" is set to "Single Event" - ThinkCentre


      Usually, after updating the BIOS in the operating system, the system will reboot and continue to update the BIOS.  If the BIOS item "Wake Up on Alarm" is set to "Single Event", then after reboot, the BIOS update process will not continue.

      The result is the main BIOS version and the Boot Block version does not match.  This will cause unexpected system issues.

      NOTE: The default value of “Wake Up on Alarm” is disabled.  With this value, the user will not experience this issue.

      Affected configurations

      The above symptom is associated with the following systems:

      • ThinkCentre M92/p Tiny
      • ThinkCentre M78
      • ThinkCentre M72e Tiny
      • ThinkCentre M72z
      • ThinkCentre M62z
      • ThinkCentre Edge92
      • ThinkCentre Edge72z
      • ThinkCentre Edge72
      • ThinkCentre Edge92z 
      • ThinkCentre M92z

      System is configured with:

      • BIOS item "Wake Up on Alarm" is set to "Single Event"

      Operating Systems:

      • Microsoft Windows 7
      • Microsoft Windows 8
      • Microsoft Windows Vista
      • Microsoft Windows XP
      • Microsoft Windows 2000
      • Microsoft Windows PE
      • Microsoft Windows Server
      • DOS

      If the power to the system is interrupted while the POST and BIOS is being updated, the system may not restart correctly. If this occurs, perform the following procedure to recover from the POST and BIOS update failure. This procedure is commonly called the Boot Block Recovery.

      1. Remove all media from the drives and turn off all attached devices and the system.  Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the system.
      2. Remove the system cover.
      3. Locate the Clear CMOS/Recovery jumper on the system board.  See “Locating parts on the system board”.
      4. Remove any parts and disconnect any cables that might prevent your access to the Clear CMOS/Recovery jumper.
      5. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and pin 3).
      6. Reinstall any parts and reconnect any cables that have been removed or disconnected.
      7. Reinstall the system cover and reconnect the power cords for the system and monitor.
      8. Turn on the system and then insert the original POST and BIOS update (Flash update) disc into the optical drive.  Wait a few minutes and then the recovery session will begin.  The recovery session will take two to three minutes.  During this time, a warning message will be displayed and no action is needed from the user.
      9. After the recovery session is completed, there will be no video, and the system will automatically turn off.
      10. Repeat Step 1 through Step 4.
      11. Move the jumper back to the standard position (pin 1 and pin 2).
      12. Reinstall any parts and reconnect any cables that have been removed or disconnected.
      13. Reinstall the system cover and reconnect power cords and all other external cables.
      14. Turn on the system to restart the operating system.



      The user should set "Wake Up on Alarm" to "Disabled" before updating the BIOS.


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      • Alias ID: SF13-D0081
      • Document ID: HT077544
      • Last Updated :17 Jun 2014
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