How to Update a Lenovo BIOS with USB

Lenovo provides an ISO for CD/DVD burning and an EXE for running the executable from within Windows.  There is NO support for an ISO booting from a USB.  Many modern laptops are ordered without a CD ROM and maybe an extra hard drive in it's place.  Most people use USB sticks for the majority of their effort when the need for a local physical media storage device is needed. This guide will show you how to get an ISO from Lenovo and extract it to a USB stick and make that stick bootable.

There are a few ways to go about this.  For me, the easiest was to use a CentOS 7 VM on a Windows box.

Download the CD ISO image to your Linux CentOS VM from the Lenovo site.


Download and install the geteltorito script from RPM.

yum install -y geteltorito

Convert the ISO to IMG (El Toroito)

geteltorito -o bios.img g4uj32us.iso

Create a Bootable USB

The Windows Way (tested)

Copy the bios.img file to your Windows machine and burn it to your USB with the rufus utility.

The Linux Way (untested)
dd if=bios.img of=/dev/sdX
  • unmount the device ("USB") first.
  • Replace bios.img with the path to the IMG file on your file system and /dev/sdX with the path to your USB or SD card device. Be careful to specify the correct disk, otherwise you may write the contents of the image to your operating system drive or something else of value.
  • Make sure that it’s as "sdx" not as "sdxn" where 'n' is a number, such as '1' or '2'

Take the USB to your Lenovo and boot to the USB stick.  You should be presented with a menu of choices.