Download Files
File Format: 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.
File Name: 5550A21.exe
File size: 8.59 MB
To ensure the integrity of your download, please verify the checksum value.
MD5: 98e7d5f08dbc1554ff04d29a9c727164
SHA1: 11aeff6352144204a3735af321fa357180305eaf
SHA-256: dbfcfc7b5568f55989528024d9090239dddeee2d50a7a43850bb11e4f0750e79
File Format: This file format contains plain text which can be viewed with a standard text editor.
File Name: 5550A21.txt
File size: 13.21 KB
To ensure the integrity of your download, please verify the checksum value.
MD5: ad4871dd32987a076482014386821105
SHA1: 74df3f2768fd72b02b63ce4630700a349ed23776
SHA-256: 3fba274dbde5b402fd409a9d6bce226b6e8faef11cc06dcc7f2f7a409ab1ac48
Fixes & Enhancements
Fixes:
- Fixed an issue with Secure Boot Option ROM Signature Verification.
Enhancements:
- Not Applicable
Important Information
- It is recommended that you do not downgrade the BIOS to version A02 or prior due to downgrade restrictions.
- This update can only be installed on systems that does not contain an e-dock socket.
Supported Operating Systems
Installation instructions
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.
Note 2: Do not turn off the power or interrupt the BIOS update process during the update.
Run the BIOS update utility from Windows environment.
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 and 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.
Run the BIOS update utility from DOS environment (Non-Windows users)
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_5550_X.Y.Z.exe
Where C is the drive letter of the USB device where the executable file is located and Latitude_5550_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.
Updating the BIOS from a DOS environment with UEFI boot mode (Non-Windows users, Load Legacy Option Disabled)
1. Copy the downloaded file to a bootable DOS USB drive.
2. Power on the system and then go to BIOS Setup by pressing the F2 key.
3. Go to General > Boot Sequence > Boot > Boot List Option.
4. Change UEFI to Legacy of Boot List Option.
5. Go to Exit > Save Changes and reboot system.
6. Press F12 and then select USB Storage Device and boot to the DOS prompt.
7. Run the file by typing the file name.
The system restarts automatically and updates the BIOS at the system startup screen. After the BIOS update is complete, the system restarts again.
8. Go to BIOS Setup by pressing the F2 key and go to General > Boot Sequence > Boot > Boot List Option.
9. Change Legacy to UEFI Boot Option.
10. Go to Exit > Save Changes and reboot the system.