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 Latitude E5420 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 contains the Dell system BIOS update. BIOS is a firmware package that is embedded on a small memory chip on the system board. It controls the keyboard, monitor, disk drives, and other devices.
To view all drivers for your Latitude E5420, go to Drivers and downloads.
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E5420A12.exe | 2.9 MB
Enter the Service Tag of your device to check the compatibility of this download with your device.
This is a large file. Depending on your connection speed, it may take some time to download.

File Format: CPG BIOS Executable for Windows/DOS
File Name: E5420A12.exe
File Size: 2.9 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:
559369a03976834746a882ab96979647
SHA1:
363e4b684c4982e57701c43a7be4db96ba3423f0
SHA-256:
3cb4b243a53f9dd47f0fbd98260a7fcfc1aee1cd6fa7c624658a4542daa9070c

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

Fixes & Enhancements

- Updated the Preboot System Assessment (ePSA) diagnostics to version 4220.11.
- Updated the Intel Management Engine (ME) Firmware to version 7.1.70.1198.
Read More

Version

A12, A12

Release date

28 Mar 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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- If your system is enabled with signed firmware update and BIOS version is A01 or earlier, you must install the BIOS version A02 before installing the latest BIOS version.
A1417 Jan 2014
A1331 Jul 2013
A1118 Feb 2013
A0929 Aug 2012
A0807 Aug 2012
A0725 Apr 2012
A0517 Jan 2012
Dell Latitude E5420
Updating the BIOS from Windows

Note 1: Before updating the BIOS, ensure that you suspend BitLocker encryption on a BitLocker-enabled system. If BitLocker is not enabled on your system, you can ignore this step. For information about how to disable BitLocker, see How to Enable or Disable BitLocker with TPM in Windows at support.dell.com.
Note 2: Do not turn off power or interrupt the BIOS update process during the update.

Download and Installation
1. Click Download File.
2. Click Save to save the file to your hard drive.
3. Browse to the location where you downloaded the file.
4. Double-click the new file.
The system restarts automatically and updates the BIOS at the system startup screen. After the BIOS update is complete, system restarts again.

Updating the BIOS from DOS (Non-Windows users)

Note 1: Before updating the BIOS, ensure that you suspend BitLocker encryption on a BitLocker-enabled system. If BitLocker is not enabled on your system, you can ignore this step. For information about how to disable BitLocker, see How to Enable or Disable BitLocker with TPM in Windows at support.dell.com.
Note 2: Do not turn off power or interrupt the BIOS update process during the update.

Installation
Note: You must provide a bootable USB drive. This executable file does not create the DOS system files.
1. Copy the downloaded file to a bootable USB drive.
2. Power on the system and then Press the F12 key.
3. Select USB Storage Device and boot to the DOS prompt.
4. Run the file by typing following command. For example:
C:\ Latitude_E5420_X.Y.Z.exe
Where C is the drive letter of the USB device where the executable file is located and Latitude_E5420_X.Y.Z.exe is the name of the downloaded file.
The system restarts automatically and updates the BIOS at the system startup screen. After the BIOS update is complete, system restarts again.

Need help with BIOS issues?

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

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