This is the original draft of a KB article written for the Lenovo forums. It may be old news, but I’ve only recently come across it. There are likely other ways to do this using the ISO instead of the .exe – perhaps grub2 + loop-mounting, grub2 + memdisk, geteltorito – but this is the “official” Lenovo approach.
Full disclosure: I haven’t yet actually had occasion to build the flash drive and test the BIOS update process.
Traditionally, ThinkPad BIOS updates have been provided for download in two formats: a Windows .exe installer, and an ISO that can be used to create a bootable CD. The CD version was useful for those who aren’t running a Windows OS, or who have a damaged main drive or OS that won’t boot.
These days, an optical drive is becoming a rarity – requiring the use of an external drive. Fortunately, with recent ThinkPad BIOS updates using a bootable flash drive has become an option. The instructions and tools are included in the Windows .exe. It’s necessary to run the 1st stage of the install to access them, so a Windows PC or virtual machine is required.
We’ll use a 1st generation X1 Yoga BIOS in this example. Be sure to use a BIOS .exe that matches your laptop model, not the one in this example.
The first step is to download the .exe for the BIOS installer desired. Start with the Lenovo main support page https://support.lenovo.com/us/en enter your laptop model in the search box, select the appropriate model from the list offered, navigate the Drivers and Software link to the BIOS download.
The way the .exe is built it’s necessary to run the first stage of the install to be able to access the contained files.
Locate the downloaded .exe and run it. You’ll be offered a target folder and the option to browse for a target folder of your choosing. Make a note of where the driver files are going and proceed.
The next phase of the process will ask to actually install the BIOS on the current PC or virtual machine. Don’t let it. Un-check the “Install ThinkPad BIOS Update Utility Now” check box and click Finish.
Now you can navigate to the installer files. You should see something like the below. Read and follow the instructions.