Technical Support Bulletin
TSB2C03F80002R01

   
Necessary changes in the UEFI Firmware (BIOS) for a successful downgrade from Windows 8 to Windows 7


    Document details:

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 Product:
 
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 Model No.:
 
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 Operating System:
Windows 7 - 32 Bit, Windows 7 - 64 Bit, Windows 8 - 32 Bit, Windows 8 - 64 Bit, Windows 8 - Upgrade
   more details...  


    Issue:

If Windwos 8 is preinstalled on your notebook and you want to downgrade the OS to Windows7, some changes must be done in the UEFI FW before you're be able to install Windows 7.


    Summary:

Steps to follow for the downgrade to Windows 7:

  • Create recovery media for your Windwos 8 system before you proceed to any other step, otherwise you will be not able to install Windwos 8 OS again on your device! 
  • Proceed to the changes in the UEFI FW ( BIOS) before the installation
  • Install the Windows 7 OS on the notebook


    Resolution:

If you want to install Windows 7 instead of Windows 8 you have to perform some changes in the UEFI firmware first.

  1. Enter the UEFI firmware (formerly known as BIOS) by long-press the F2 button and turn on the notebook.
    Go to the "Security" tab and change the value of the "Secure Boot" option to "Disabled"



  2. Go to  "Advanced" tab -> "System Configuration" -> and change the "Boot Mode" option from "UEFI Boot" to "CSM Boot"



  3. Save and close the UEFI settings by pressing the F10 key. 

If this steps are done, Windows 7 can be installed on the Notebook without any problems.



    Disclaimer:

Toshiba provides this information "as is" without warranty of any kind, either express or implied, including, but not limited to, the implied warranties of merchantability or fitness for a particular purpose. Toshiba shall not be responsible for the topicality, correctness, completeness or quality of the information or software provided. Toshiba is not liable for any damage caused by the use of any information or software provided, including information that is incomplete or incorrect. Any trademarks used herein belong to their respective owners.


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