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.

Before updating the BIOS, please suspend BitLocker encryption. If it is not enabled on your system, you can skip this step. Learn more

Dell XPS 15 9550 1.5.1 System BIOS

Restart required
XPS 15 9550 1.5.1 BIOS

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An updated version of this driver may be available.

This driver is up-to-date

The driver information is up-to-date. To view all drivers for your XPS 15 9550, go to Drivers & Downloads.

Fixes & Enhancements

1. Enhance audio quality when the brightness is adjusted
2. Extending battery support
3. Allows Dell Command Configure to implement the required Thunderbolt Sec Level settings without the need to access the BIOS.
4. Fixed a Bitlocker recovery issue when Dell Thunderbolt Dock is connected to the system, and PCR1 is selected in the Bitlocker Group Policy
Updated Dell Dock Port Type Classification in SMBIOS Table
5. Fixed a Bitlocker recovery issue when Dell Type C Dock or Dongle is connected to the system, and PCR2 is selected in the Bitlocker Group Policy
Improved PCR2 measurement consistency when a Dell Type C Dock or Dongle is connected.
6. Updated the handling of pre-boot authentication information by firmware.
Updated UEFI variable input validation.
Updated the handling of 3rd party Option ROM loading.
Updated SPI flash command configuration settings.


Version 1.5.1, 1.5.1



Release date

14 Nov 2017

Last Updated

14 Nov 2017


Available formats

File Format: Windows/DOS
File Name: XPS_9550_1.5.1.exe
Download Type: HTTP
File Size: 9.32 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.

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

1.13.1 06 Jan 2020
1.12.0 18 Nov 2019
1.11.2 28 Aug 2019
1.9.0 23 Aug 2019
1.10.0 21 Mar 2019
1.8.0 05 Oct 2018
1.7.0 04 May 2018
1.6.1 06 Feb 2018
1.4.0 15 Sep 2017
XPS 15 9550 System BIOS
Download file to Desktop
The file XPS_9550_X.Y.Z.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 XPS_9550_X.Y.Z.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 XPS_9550_X.Y.Z.exe to a bootable USB key.
2. Boot from the USB key to the DOS prompt.
3. Run the file by typing A:\ XPS_9550_X.Y.Z.exe (where A is the drive letter where the executable is located).

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