BIOS Update Utility for Windows 8 (32-bit, 64-bit), 7 (32-bit, 64-bit), Vista (32-bit, 64-bit), XP – ThinkPad L420, L421 and L520

NameOperating SystemVersionReleasedDownload
BIOS Update Utility
8guj17us.exe
3.14 MB
Windows 7 32bit,
Windows 7 64bit,
Windows 8 32bit,
Windows 8 64bit,
Windows Vista 32bit,
Windows Vista 64bit,
Windows XP
1.2308 Oct 2013 Download
README for BIOS Update Utility
8guj17us.txt
16.36 KB
Windows 7 32bit,
Windows 7 64bit,
Windows 8 32bit,
Windows 8 64bit,
Windows Vista 32bit,
Windows Vista 64bit,
Windows XP
1.2308 Oct 2013 Download

This package updates the 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 systems


  • L420, L421, L520

Supported Operating Systems


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