This repository contains various UEFI firmwares extracted using https://github.com/theopolis/uefi-firmware-parser
uefi-firmware-parser -o ./Output -O -b -g XBL ./11
Where ./11 is an UEFI image.
Note: Open up the folders and see if there's an .obj about 2MB, if there is and it isn't extracted(check with 7zip), then use the program on that file Note2: To see the revision string open up .te files in 7zip, you'll find them somewhere :P