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 provides the Dell System BIOS Update and is supported on Dell OptiPlex 990 for Windows and DOS Operating Systems.
To view all drivers for your OptiPlex 990, go to Drivers and downloads.
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O990-A18.exe | 5.59 MB
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File Format: CPG BIOS Executable for Windows/DOS
File Name: O990-A18.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:
76c1e2e5eec4ea7139599c472e9949c4
SHA1:
356ddca29b37b77b067f4d6095d023228681c2d7
SHA-256:
007676638239c88ca34fa2d74ec688965dcbcc9adae7ff0c301b6145fd3a7776

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

Fixes & Enhancements

Fixes
- Addressed system does not respond to keyboard intermittently
- Addressed UEFI OS fail boot with HDD password present issue
- Addressed CCTK issues

Enhancements
- Improved the compatibility of PCI devices and USB devices
- Updated Intel Microcode for SandyBridge processor
- Updated Intel PXE ROM
Read More

Version

A18, A18

Release date

30 Sep 2013

Download Type

System BIOS

Category

BIOS

Importance

Recommended
Dell Technologies recommends applying this update during your next scheduled update cycle. The update contains changes to maintain overall system health. It ensures that the system software remains current and compatible with other system modules (firmware, BIOS, drivers, and software) and may include other new features.

Additional details

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1. Please note that if the A04 or before A04 BIOS is currently installed on your system you must first update to A05 BIOS and then flash to the latest A-rev BIOS.
2. Please note that if the A05 or after A05 BIOS and before A10 is currently installed on your system you must first update to A10 BIOS and then flash to the latest A-rev BIOS.
A2421 Aug 2018
A2307 Mar 2018
A1923 Sep 2015
A1721 Mar 2013
A1615 Oct 2012
A1510 Sep 2012
A1406 Sep 2012
A1324 May 2012
A1108 Mar 2012
A1008 Dec 2011
Dell Optiplex 990
BIOS Update Executable for Windows/DOS

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.

Run the BIOS update utility from DOS environment (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.
4. DOS System will auto restart and update BIOS while system startup screen.
5. After BIOS update finished, system will auto reboot to take effect.

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Note 1: You will need to provide a bootable DOS USB key. This executable file does not create the DOS system files.
Note 2: 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.

Reboot will be required

Need help with BIOS issues?

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

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