BIOS Update Utility for Windows 8 (32-bit, 64-bit), 7 (32-bit, 64-bit), Vista (32-bit, 64-bit), XP – ThinkPad W520

NameOperating SystemVersionReleasedDownload
BIOS Update Utility
8buj21us.exe
5.5 MB
Windows 7 32bit,
Windows 7 64bit,
Windows 8 32bit,
Windows 8 64bit,
Windows Vista 32bit,
Windows Vista 64bit,
Windows XP Service Pack 3
1.4220 Aug 2013 Download
README for BIOS Update Utility
8buj21us.txt
24.65 KB
Windows 7 32bit,
Windows 7 64bit,
Windows 8 32bit,
Windows 8 64bit,
Windows Vista 32bit,
Windows Vista 64bit,
Windows XP Service Pack 3
1.4220 Aug 2013 Download

This package updates the UEFI BIOS (including system program and Embedded Controller program) stored in the ThinkPad computer to fix problems, add new functions, or expand functions as noted below.

Use the link below to obtain the BIOS in other file formats:


Supported ThinkPad system


  • W520

Supported Operating Systems


Supported Operating Systems

  • Windows 8 32-bit, 64-bit
  • Windows 7 32-bit, 64-bit
  • Windows Vista 32-bit, 64-bit
  • Windows XP Professional SP3