UEFITool allows the modification, parsing, and extraction of UEFI firmware images.

It supports full BIOS image parsing including the flash descriptor or any binary files containing UEFI volumes, it is compatible with multiple BIOS image types, including ROM, BIN, FD, CAP, BIO, WPH and EFI, all of which will be conveniently loaded and displayed alongside pertinent details including name, type/subtype and text for example.

UEFITool will permit you to extract data from an image, insert items within the structure of the image, you will also be able to insert or remove unwanted pieces as needed. Upon completion of the editing process, you can easily export the image.