Dell Dimension System BIOS, A12

Dimension 4600 and Dimension 4600i A12 System BIOS

Fixes & Enhancements

The following changes have been made to BIOS rev A10 to create A12:

1. Fixed Quick Boot menu when no bootable drives are selected in SETUP.
2. Updated microcode for newer CPUs.
3. Eliminated possible hang on next boot when AC power is removed.
4. Fixed intermittent hang in resuming from Standby.
5. Improved keyboard test when booting from Hibernate.
6. Fixed possible hang after unplugging and re-plugging USB hubs.
7. Increased USB keyboard wait time to allow all USB devices being enumerated.
8. Added to support in PXE boot environments with Spanning Tree enabled.
9. Prevent false MCE errors from causing "bad CPU" error in POST.
10. Fixed floppy access failures when CD floppy emulation is turned off.


Version A12, A12



Release date

27 Sep 2004

Last Updated

03 Nov 2011


Available formats

File Format:Windows/DOS
File Name:D4600A12.EXE
Download Type:HTTP
File Size: 524 KB
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.
Not available
Not available
Not available

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

Applies to
Dimension System BIOS
Installation instructions

Installation Instructions for the Universal (Windows/MS DOS) format

  1. Download file to Desktop

  2. Use one of the methods below to flash the Bios.

Download file to Desktop

The file D4600A12.EXE is using the Universal (Windows/MS DOS) format and is designed to be directly executed from Windows environment.

  1. Click Download now.
    The Export Compliance Agreement appears.

  2. Read the Export Compliance Agreement.

  3. If you agree, click to select I agree..
    The File Download window appears.

  4. Click the Save button.
    The Save As window appears.

  5. Select Desktop using the drop-down menu to the right of Save in.

  6. Click the Save button.
    A progress meter moves as the download is completed.

  7. If necessary, click X in the upper right-hand corner of the Download Progress Window to close it upon completion.

NOTE:Shut down all other applications prior to running the BIOS update utility. The update utility reboots your system in order to get the new BIOS loaded.

Run the BIOS update utility from Windows environment

  1. Double click the Icon on your desktop labeled D4600A12.EXE.

    The Dell BIOS Flash window appears

  2. Click the Continue button.

    The message Pressing OK will close all applications, shut down Windows, Flash the BIOS, then reboot. appears.

  3. Click the OK button.

    The system will restart and the BIOS Flash will be completed.

Run the BIOS update utility from MS DOS environment (Non-Windows users)

NOTE:You will need to provide a bootable DOS diskette. This executable file does not create the MS DOS system files.

  1. Copy the file D4600A12.EXE to a bootable floppy.

  2. Boot from the floppy to the MS DOS prompt.

  3. Run the file by typing Y:\D4600A12.EXE (where y is the drive letter where the executable is located).

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 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.