Download Files
File Format: 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.
File Name: Precision_5520_1.9.4.exe
File size: 9.93 MB
To ensure the integrity of your download, please verify the checksum value.
MD5: baa63d39233052ec91391b34795c7c1b
SHA1: 1ebb1023cbb4c9bacc4d4835ae767a4596723391
SHA-256: c9023549b497381374e65ef735d4c81a6bcecabba10d0db6d68719f7c65baa12
Fixes & Enhancements
Enhancements:
1. Improve startup stability when the RTC battery voltage is low.
2. Improve WiFi switching stability when Dell thunderbolt dock TB16 is disconnected during sleep.
3. Prevent ghost key trigger while pressing multiple keys at the same time.
4. Prevent wake on malfunction in AC mode while battery depleted.
5. Change default setting to Prompt on Warnings and Error
Important Information
Important:
- Not suggested/allowed to downgrade BIOS to the version before 1.9.4
Supported Operating Systems
Installation instructions
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.
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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).
Applies to
Precision 5520 System BIOS