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 990 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 Dell system BIOS update. BIOS is a firmware that is embedded on a small memory chip on the system board. It controls the keyboard, monitor, disk drives, and other devices. This update addresses the Intel Security Advisories INTEL-SA-00075 (CVE-2017-5689). A security advisory is a statement when a product is impacted by a security vulnerability and a remedy is available.
To view all drivers for your OptiPlex 990, go to Drivers and downloads.
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O990-A20.exe | 5.59 MB
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File Format: CPG BIOS Executable for Windows/DOS
File Name: O990-A20.exe
File Size: 5.59 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:
d55b8e967072e30e98910b5cd649462b
SHA1:
95c5021ffd8bcc14f63b0905a300e81a7740d5a8
SHA-256:
d1a6d83b15449cb19e577f41250840a2cd9f23b5f5d45ba3357baed24419941e

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

Fixes & Enhancements

- Updated Intel ME Firmware to address security advisory INTEL-SA-00075 (CVE-2017-5689).
Read More

Version

A20, A20

Release date

02 Jun 2017

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 your system BIOS version is A04 or a version earlier to A04, update the BIOS to version A05 and then install the latest update.
- If your system BIOS version is A05 or a version earlier to A10, update the BIO to version A10 and then install the latest update.
A2421 Aug 2018
A2307 Mar 2018
A1923 Sep 2015
A1830 Sep 2013
A1721 Mar 2013
A1615 Oct 2012
A1510 Sep 2012
A1406 Sep 2012
A1324 May 2012
A1108 Mar 2012
A1008 Dec 2011
Dell Optiplex 990
Updating the BIOS from Windows

Note 1: Before updating the BIOS, ensure that you suspend BitLocker encryption on a BitLocker-enabled system. If it is not enabled on your system, you can ignore this step. For information about how to disable BitLocker, see How to Enable or Disable BitLocker with TPM in Windows at support.dell.com.
Note 2: Do not turn off the power or interrupt the BIOS update process during the update.

Download and Installation
1. Click Download File, to download the file.
2. 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.
The system restarts automatically and updates the BIOS at the system startup screen. After the BIOS update is complete, system restarts again.

Updating the BIOS from DOS (Non-Windows users)

Note 1: Before updating the BIOS, ensure that you suspend BitLocker encryption on a BitLocker-enabled system. If it is not enabled on your system, you can ignore this step. For information about how to disable BitLocker, see How to Enable or Disable BitLocker with TPM in Windows at support.dell.com.
Note 2: Do not turn off power or interrupt the BIOS update process during the update.

Installation
Note: You must provide a bootable USB drive. This executable file does not create the DOS system files.
1. Copy the downloaded file to a bootable USB drive.
2. Power on the system and then Press the F12 key.
3. Select USB Storage Device and boot to the DOS prompt.
4. Run the file by typing following command. For example:
C:\ OptiPlex_990_X.Y.Z.exe
Where C is the drive letter of the USB device where the executable file is located and OptiPlex_990_X.Y.Z.exe is the name of the downloaded file.
The system restarts automatically and updates the BIOS at the system startup screen. After the BIOS update is complete, system restarts again.

Need help with BIOS issues?

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

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