Comment 219 for bug 1734147

@toxicpublic

It depends on your model number. My sequence was:

1) Go to support.lenovo.com
2) Type your serial number in the box
3) Click "Drivers and Software" in the blue bar
4) Select Windows 10 64-bit in the "Operating Systems" drop down menu
5) Select BIOS/UEFI in the "Components" drop down menu
6) There should be two options - one is a driver that needs to be installed through Windows, and the second is a bootable ISO that you can download and burn to a CD. That's what I did, incidentally, I didn't try to dd it to a flash drive.