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 XPS 15 9550 1.2.21 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.XPS 15 9550 1.2.21 BIOS
To view all drivers for your XPS 15 9550, go to Drivers and downloads.
Recommended
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XPS_9550_1.2.21.exe | 9.24 MBEnter 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:
XPS_9550_1.2.21.exe
File Size:
9.24 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:
da20e297afa1a60100cd47e9584b458c
SHA1:
622d47fb5c7a5efd6a17bed8effd8cbc926c116e
SHA-256:
b46430489b52c6e98732102166d58590d042c64e3284725f953eaad8b1de103d
Sign in to Windows as an admin to use automatic scan. If your're already signed in as an admin and seeing this message, please reboot.
Your system is managed by your IT admin and features might be limited.
Find more updates. Use SupportAssist to find all the latest driver updates for your device.
Fixes & Enhancements
Fix:
1. SUT will show incorrect massage after run DG_Readinesstool_v2.0.ps1 on Enterprise OS
2. Clear TPM Option greyed out in BIOS
3. Enable Attempt Legacy Boot" cannot be enabled in BIOS
4. USB LAN and Audio of IE dock still working after disable Dell Docks and Ext. USB
Read More
1. SUT will show incorrect massage after run DG_Readinesstool_v2.0.ps1 on Enterprise OS
2. Clear TPM Option greyed out in BIOS
3. Enable Attempt Legacy Boot" cannot be enabled in BIOS
4. USB LAN and Audio of IE dock still working after disable Dell Docks and Ext. USB
Version
1.2.21, 1.2.21
Release date
31 Mar 2017
Download Type
System BIOS
Category
BIOS
Importance
CriticalDell Technologies highly recommends applying this important update as soon as possible. The update contains critical bug fixes and changes to improve functionality, reliability, and stability of your Dell system. It may also include security fixes and other feature enhancements.
Supported Operating Systems
BIOS
Looking for a different OS? View the list of Dell supported operating systems
Applies to
XPS 15 9550 System BIOS
Need help with BIOS issues?
Find a solution in Dell's BIOS troubleshooting and usage guide.Drivers help and tutorials
For more downloads go to the Drivers and downloads.
For help on using the information on this page, please visit Driver Help and Tutorials.