I can't find any Lenovo official documentation, but if you google for something like "lenovo laptop fn+r bios usb" you'll find a bunch of tutorials for how the

I can't find any Lenovo official documentation, but if you google for something like "lenovo laptop fn+r bios usb" you'll find a bunch of tutorials for how the recovery works. It does not work on the Flex model line-up though (I presume because they didn't include the bootstrapper firmware or some h/w component).