Updating Lenovo T460 BIOS (UEFI, firmware) without a CD on Linux

Some of Lenovo's newer models come with a firmware update distribution compatible with fwupd so you can just do a firmware update directly from the shell.

This is not the case for the T460, which has a bootable ISO, or a Windows installer that ... creates a bootable ISO.

I couldn't find my USB CD/DVD drive so I landed up finding a workaround.