Do not turn off your computer or disconnect from the power source while updating the BIOS as this could harm your computer. During the update, your computer will restart and you may briefly see a black screen.

Before updating, please read the installation instructions and important information noted below.

Dell Optiplex 790 System BIOS

Restart required AUTO INSTALLED This file was automatically installed as part of a recent update. If you are experiencing any issues, you can manually download and reinstall.
This package contains the BIOS update for Dell OptiPlex 790 that runs Windows and DOS operating systems. BIOS is a firmware that is embedded on a small memory chip on the computer's system board. It controls the keyboard, monitor, disk drives and other devices. This package contains the update for CPU microcode to address Intel Security Advisory INTEL-SA-00115 (CVE-2018-3639 and CVE-2018-3640).
To view all drivers for your OptiPlex 790, go to Drivers and downloads.
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O790-A22.exe | 5.58 MB
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File Format: CPG BIOS Executable for Windows/DOS
File Name: O790-A22.exe
File Size: 5.58 MB
Format Description
This file format consists of a BIOS executable file. The Universal (Windows/MS DOS) format can be used to install from any Windows or MS DOS environment.
To ensure the integrity of your download, please verify the checksum value.
MD5:
3d4ae526e756a3bc7cecb31de83cdcac
SHA1:
d41e1a6fcc00c7feb984136487423bce94aa4a5e
SHA-256:
588d81e6467cf348a836f9b734d8e31c7eb82cb34f11dc3284678fff07335ca1

Find more updates. Use SupportAssist to find all the latest driver updates for your device.

Fixes & Enhancements

Fixes:
- Updated CPU microcode to address security advisory Intel Security Advisory INTEL-SA-00115 (CVE-2018-3639 & CVE-2018-3640).

Enhancements:
- Not applicable.
Read More

Version

A22, A22

Release date

21 Aug 2018

Download Type

System BIOS

Category

BIOS

Importance

Critical
Dell Technologies highly recommends applying this important update as soon as possible. The update contains critical bug fixes and changes to improve functionality, reliability, and stability of your Dell system. It may also include security fixes and other feature enhancements.

Additional details

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If BIOS version A04 or earlier is currently installed on your system, you must first update to BIOS version A05 and then update to the latest BIOS. If BIOS version A05 or later and BIOS versions before A10 is currently installed on your system, you must first update to BIOS version A10 and then update to the latest BIOS.
A2121 Mar 2018
A1902 Jun 2017
A1830 Sep 2013
A1721 Mar 2013
A1615 Oct 2012
A1510 Sep 2012
A1406 Sep 2012
A1324 May 2012
A1108 Mar 2012
A1008 Dec 2011
A0522 Jun 2011
A0303 May 2011
A0219 Apr 2011
Dell Optiplex 790
Updating the BIOS through Windows
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.
3. Browse to the location where you downloaded the file and double-click the new file.
Windows System will restart automatically and update BIOS at the system startup screen.
After BIOS update is completed, system will reboot automatically to take effect.

Updating the BIOS from a DOS environment with Legacy boot mode (Non-Windows users)
1. Copy the downloaded file to a bootable DOS USB key.
2. Power on the system, then Press F12 key and Select USB Storage Device and Boot to DOS prompt.
3. Run the file by typing copied file name where the executable is located.
DOS System will restart automatically and update BIOS at system startup screen.
After BIOS update is completed, system will reboot automatically to take effect.

Updating the BIOS from a DOS environment with UEFI boot mode (Non-Windows users, Load Legacy Option Disabled)
1. Copy the downloaded file to a bootable DOS USB key.
2. Power on the system, then go to BIOS Setup by pressing F2 key and go to General > Boot Sequence > Boot > Boot List Option.
3. Change UEFI to Legacy of Boot List Option.
4. Go to Exit > Save Changes and reboot system.
5. Press F12, then Select USB Storage Device and Boot to DOS prompt.
6. Run the file by typing copied file name where the executable is located.
DOS System will restart automatically and update BIOS at system startup screen.
After the BIOS update is finished, system will reboot automatically.
7. Go to BIOS Setup by pressing F2 key and go to General > Boot Sequence > Boot > Boot List Option.
8. Change Legacy to UEFI Boot Option.
9. Go to Exit > Save Changes and reboot system.

Note 1: You must provide a bootable DOS USB drive. This executable file does not create the DOS system files.
Note 2: Ensure that you suspend BitLocker encryption before updating BIOS on a BitLocker-enabled system. If you do not enable BitLocker on your system, you can ignore this step.

Need help with BIOS issues?

Find a solution in Dell's BIOS troubleshooting and usage guide.

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