Dell Precision Workstation T5810

A11 and all earlier BIOS releases are incompatible with Intel Xeon E5-16xx/26xx-v4 CPUs (Broadwell) , Customers who wish to downgrade from A12 (minimum revision to support Broadwell) or higher must first go through A11 before going to their target BIOS rev. This is due to some significant changes required to enable v4 (Broadwell) CPUs and at the same time allowing Xeon E5-16XX/26XX v3 (Haswell) CPUs and v4 (Broadwell) CPUs BIOS to stay in one BIOS stream. All versions of the Broadwell CPU enabled BIOS (A12+) understand how to migrate the Haswell settings. There are no upgrade restrictions. To downgrade below A12, a user must flash to A11 first. It is the only V3 (Haswell) BIOS with v4 (Broadwell) downgrade logic in place.

BIOS Update Executable for Windows/OS independent

Download
1. Click Download File to download the file.
2. When the File Download window appears, click Save to save the file to your hard drive.

Run the BIOS update utility from Windows environment
1. Browse to the location where you downloaded the file and double-click the new file.
2. Windows System will auto restart and update BIOS while system startup screen.
3. After BIOS update finished, system will auto reboot to take effect

Perform the BIOS update from the BIOS Boot Menu, independent of operating system.
1. Copy the downloaded file to a USB flash device. It does not need to be bootable
2. Insert the USB flash device into any USB port
3. Power on the system
4. At the DELL logo screen, press F12 to access the one time boot menu
5. Select "BIOS Flash Update" in the "Other Options" section
6. Click on the "..." button to browse the USB flash device to locate the downloaded file
7. Select the file and click "Ok"
8. Confirm the Existing System BIOS Information and the BIOS Update Information are as expected
9. Click "Begin Flash Update"
10. Reviewing the Warning message and click "Yes" to proceed with the update
11. The system should restart and show a Flash Progress bar on the Dell logo screen as the BIOS update is being performed
12. The system will restart once again when the Flash update is complete

Note 1: Please make sure you suspend BitLocker encryption before updating BIOS on a BitLocker enabled system. If you don't enable BitLocker on your system you can ignore it.