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Driver Details

Dell OptiPlex System BIOS, A05
Optiplex GX400 A05 FlashBIOS
Release Date 10/17/2001
Importance: Optional
Version: A05

The following formats are available for the file you have selected

File Format: Floppy Download File Download File
File Name:


Description: This file contains a compressed (or zipped) set of files. Download the file to a folder on your hard drive, then double-click it to unzip the set of files. Follow the instructions to complete the installation.
Download Type: HTTP
File Size: 470KB

File Format: Non-Packaged Download File Download File
File Name:


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.
Download Type: HTTP
File Size: 325KB

Previous Versions

No previous version available.


Optiplex GX400 A05 FlashBIOS

Level of Importance:Optional

Dell recommends the customer review specifics about the update to determine if it applies to your system. The update contains changes that impact only certain configurations, or provides new features that may/may not apply to your environment.

Important Information

The Non-packaged format is intended for advanced users that only require the executable and do not require a bootable self-extracting disk to be created for them. All other users should download the Floppy format, which creates a bootable self-extracting disk.


OptiPlex GX400
Operating Systems

Applies to

  • Dell Device
  • OptiPlex System BIOS

Fixes & Enhancements

The following changes were made to the A04 BIOS to create A05: 1. Add IOAPIC Support for Windows 2000 and XP and 'Enable' switch in SETUP. 2. Adjust ACPI support to not report non-existant PS/2 devices. 3. Changed the NIC detect to check for NIC_VENDOR_ID. 4. Update Selectable boot support. 5. Fix various USB issues. 6. Prevent event logging code from possibly corrupting the event log. 7. Added S3 support for ICH B1 and Windows XP. 8. Reverted to old LPT initialization strategy to fix some new printer problems. 9. Fix issue where System Setup loses Primary Video setting on no-NIC boards. 10. Fixed PNP errors when installing dual Barco Cards. 11. Changed the F12 = Network Boot to F12 = Boot Menu. 12. Fix possible incorrect fan failures returning from S3 standby. 13. Fix intermittent problem that causes power LED to not light.

Installation instructions

Creating the disk:
NOTE: This procedure requires one blank, formatted 3.5-inch floppy disk; label the disk BIOS. 

1.	When the File Download window appears, click “Save this program to disk”. 
2.	Choose “Desktop” as the location. 
3.	Click “Ok”. 
4.	After the file has finished copying files, click “Close”. 
5.	Press the “Windows” + “M” keys at the same time to minimize all the open windows. 
6.	Find the downloaded file on your Desktop, if it looks like a floppy disk, double-click it and skip to Step 7.

NOTE: If the Security Warning window appears, click “Yes”. 

7.	Click “Setup”. 
A DOS Window appears. 
8.	Press the “Enter” key. 
9.	Insert the floppy disk into the floppy disk drive and press the “Enter” key.  
10.	Press the “Y” key to begin copying files.
An End of the disk set prompt appears. 
11.	Press the “Enter” key. 
12.	Click the “Start” button, click “Run”, and then type a: in the Open box. Click “OK’.
The list of files on the floppy disk appears. 
13.	If there is a readme file in the list, double-click it for additional instructions. 
14.	Close all open windows and leave the disk in the floppy drive.  Skip to the section Flashing the BIOS below

NOTE: If you are creating this disk on another computer, remove the disk. Then insert it into the system that needs the BIOS flashed, and resume the procedure.

Creating the disk:
NOTE: This procedure requires one blank bootable, formatted 3.5-inch floppy disk; label the disk BIOS. 

1.	When the File Download window appears, click “Save this program to disk”. 
2.	Choose “Desktop” as the location. 
3.	Click “Ok”. 
4.	After the file has finished copying files, click “Close”. 
5.	Press the “Windows” + “M” keys at the same time to minimize all the open windows. 
6.	Insert the blank bootable formatted 3.5-inch floppy disk.
7.	Right-click the copy of the file, point to “Send To   , click “3 1/2 Floppy (a)”, and then skip to the section Flashing the BIOS below.

Flashing the BIOS:
NOTICE: Changing the system BIOS may result in unintended side affects, such as incompatibility of the new BIOS with installed hardware. If problems arise after a BIOS change, it may be necessary to return the system to the original version of the BIOS. 
1.	If you are flashing the BIOS on a portable computer, be sure that the AC adapter is plugged in and the computer is not operating on battery power. 
2.	Ensure that the Flash BIOS disk is inserted into the floppy disk drive. 
3.	Click the “Start” button, click “Shut Down”, click “Restart”, and then click “Ok”. 
The computer should restart and boot to the floppy disk.

NOTE: If the flash BIOS program does not start, and you see only an A:\ prompt, refer to the instructions from the Dell File Library page for the BIOS update or to the Readme.txt instructions. Generally, you will type the name of the executable flash BIOS file such as BGX1_A10.exe for BIOS version A10 on the OptiPlex™ series system.

A Press any key to continue prompt appears. 
4.	Press the “Enter” key. 
A Press Y to replace old BIOS with new BIOS prompt appears. 
5.	Press the “Y” key.

NOTICE: Do not interrupt the system during this process. Please refrain from pressing any keys on the keyboard, moving the mouse, or interrupting power to the system. Failure to do so could result in damage to the system BIOS.

When the computer has finished updating the BIOS, a Flash program successful. Press any key to reboot prompt appears. 
6.	Remove the floppy disk and press the “Enter” key. 
7.	The computer will now restart with the new revision of the BIOS installed. 
The boot screen will indicate the BIOS version. 

If you encounter device or resource errors after flashing the system BIOS, enter the System Setup, clear the NVRAM and restore the system defaults. For more information, refer to Dell Knowle            


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