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 Precision 5520 system BIOS

Restart required
This package provides the Dell System BIOS update and is supported on Dell Precision 5520 for Windows Operating Systems.

Fixes & Enhancements

Update to the latest CPU microcode to address CVE-2017-5715 and associated Intel Reboot issue


Version 1.7.1, 1.7.1



Release date

27 Feb 2018

Last Updated

27 Feb 2018


Available formats

File Format: Non-Packaged
File Name: Precision_5520_1.7.1.exe
Download Type: HTTP
File Size: 10.35 MB
Format Description:
This file format consists of a BIOS-executable file. To use it, download the file and copy it to a DOS-bootable USB flash drive, then boot the system to the USB flash drive and run the program.
To ensure the integrity of your download, please verify the checksum value.

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

Precision 5520 System BIOS
Download file to Desktop
The file Precision_5520_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 Precision_5520_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 Precision_5520_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:\ Precision_5520_X.Y.Z.exe (where A is the drive letter where the executable is located).
- Not suggested/allowed to downgrade BIOS to the version before1.8.0

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