OptiPlex 990 System BIOS

Fixes & Enhancements

Defects Fixed:
For DT LCM system ,BIOS will tell DellDiag the thermal sensor is no exist


Version A10, A10



Release date

08 Dec 2011

Last Updated

21 Mar 2014


Available formats

File Format:Non-Packaged
File Name:O990-A10.exe
Download Type:HTTP
File Size: 5 MB
Format Description:This file format consists of a BIOS-executable file. To use it, download the file and copy it to a DOS-bootable USB flash drive, then boot the system to the USB flash drive and run the program.
To ensure the integrity of your download, please verify the checksum value.
Not available

By downloading, you accept the terms of the Dell Software License Agreement.

Other versions
A23,A23 07 Mar 20188:11:47 AM
A11,A11 08 Mar 20122:16:47 AM
Applies to
Dell Optiplex 990
Important Information
You may run O990-A06.exe if you are already updated to A05 BIOS.
Otherwise, please update to A05 BIOS first and then flash to the lastest A-rev BIOS.
Warning: Do not turn off your computer or disconnect from your power source while updating the BIOS or you may harm your computer. During the update, your computer will restart and you will briefly see a black screen.

This driver has been tested by both the independent software vendor (ISV) and Dell on the operating systems, graphics cards, and application supported by your device to ensure maximum compatibility and performance. Details

Dell recommends applying this update during your next scheduled update cycle. The update contains feature enhancements or changes that will help keep your system software current and compatible with other system modules (firmware, BIOS, drivers and software).