Driver Details

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.

Dell Latitude E6420 System BIOS, Latitude E6420 ATG System BIOS, A05

Latitude E6420 A05 System BIOS

Fixes & Enhancements

1. Added support for Signed Firmware Updates.
2. Additional vPro support. Added DASH ‘PLDM for BIOS Control and Configuration?
3. Updated the Password Bypass feature.
4. Fixed issue where the system would not reboot the first time after disabling the Integrated NIC in Setup.
5. Addressed issues with the 'Auto-On Time' Setup field.
6. Fixed issue where a UEFI OS install would fail with greater than 8GB of memory.
7. Addressed intermittent boot issues in ATA mode.
8. Fixed issue in ATA mode where unaligned memory accesses would fail.
9. Fixed issue where the BIOS would reboot instead of flashing when the /S parameter was used with the flash executable.
10. Fixed issue where the error log data from the previous POST would show up if you shut down the machine at the F1/F2 prompt.
11. Fixed issue where the IDT audio device would not appear in device manager when running a UEFI OS.
12. Updated to the MOB_P_08 version of the Intel microcode patch.
13. Updated to the 1.3.72 version of the Intel PXE OROM.
14. Updated to the 4208 version of ePSA diagnostics.


Version A05, A05



Release date

01 Jul 2011

Last Updated

03 Nov 2011


Available formats

File Format:Windows/DOS
File Name:E6420A05.exe
Download Type:HTTP
File Size: 5 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.
Not available
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By downloading, you accept the terms of the Dell Software License Agreement.

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

  1. Download file to Desktop

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

Download file to Desktop

The file E6420A05.exe is using the Universal (Windows/ DOS) format and is designed to be directly executed from Windows environment.

  1. Click Download now.
    The File Download window appears.

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

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

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

  5. 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 E6420A05.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 DOS environment (Non-Windows users)

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

  1. Copy the file E6420A05.exe to a bootable floppy.

  2. Boot from the floppy to the DOS prompt.

  3. Run the file by typing Y:\E6420A05.exe (where y is the drive letter where the executable is located).

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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.

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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).