If you currently have a BIOS earlier than version 1.37 you should first install the official BIOS from Lenovo which will update the ECP. Note that this process does not update the Embedded Controller Program (ECP).
ThinkPad X220 Modified BIOS Update from a Bootable USBįollow these steps to flash the X220 / X220 Tablet modified BIOS from a bootable USB.