- Downgrading the System BIOS
- Downloading and Downgrading the System BIOS
Generally, while Dell does not recommend downgrading the system BIOS due to the enhancements and fixes provided in BIOS updates. Users may choose to downgrade a BIOS for various reasons, more common reasons including custom Operating System (OS) image support or enhancement requirements. Dell has made downgrading the system BIOS as simple as downloading the BIOS version wanted and following the on-screen installation wizard.
Caution: The system BIOS may get corrupted if the BIOS downgrade procedure is not completed successfully.
A corrupt BIOS is one of the possible causes of your personal computer being unable to complete POST or sometimes even boot into the operating system.
If your Dell PC supports BIOS recovery, you can recover the corrupt BIOS by using the BIOS recovery method on your Dell personal computer or tablet. See the Dell knowledge-base article
BIOS Recovery options on a Dell PC or Tablet for more information.
Note: If troubleshooting is required to resolve a system issue, Dell Technical Support may instruct users to download and install the latest functional version of the system BIOS which will overwrite any changes that are made by the instructions set out in this article.
Note: System BIOS revision that addresses an Intel Security Advisory is locked to prevent rolling back to a previous version of the system BIOS.
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Follow the instructions below:
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Browse to the Drivers & Downloads page.
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If you are asked to "Identify your product," then either enter your Service tag, or select "Browse for a product" to select manually.
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If the system shown is incorrect, click "View a different product" and again either enter your Service tag or Browse manually.
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If the correct system is already selected, then in the drop-down menus, choose the BIOS Category.
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If a different version of the BIOS is required from the one shown, click Other versions available, a box opens below.
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Select the required BIOS version then click Download File.
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Save the file to the Desktop for or a preferred location.
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When ready, right-click the downloaded file and select "Run as administrator," follow the on-screen instructions.
Note: If you are unable to locate the older BIOS version using this method, you can also try to find the download by navigating through the links that are located at:
https://downloads.dell.com
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