UEFI is not persistent by itself - anything that is persistent was also persistent on BIOS-based systems. The only remaining elements of UEFI that are accessibl

UEFI is not persistent by itself - anything that is persistent was also persistent on BIOS-based systems. The only remaining elements of UEFI that are accessible after ExitBootServices() call (done by OS during boot) is interface to edit NVRAM variables and a way to register so-called "capsules" (used, for example, for firmware updates.)