UEFITool is a program for viewing and editing BIOS and UEFI installation files. With this program, you can view all the code behind the image of a motherboard in great detail, as well as make modifications.
Although the motherboard image on a PC is commonly called BIOS, most computers today use UEFI, or Unified Extensible Firmware Interface. With it, it's possible to make a greater number of settings on the motherboard, as well as other improvements such as using a mouse to navigate its menus.
With UEFITool, you can open the update file you've downloaded for your motherboard and view its structure, verify its integrity before flashing it, or, best of all, make modifications to the image. However, it's important to know what parameters you're modifying, because if you flash an incorrectly modified file, you may be left without a motherboard or be forced to run recovery mode to flash an original firmware.
The tool on which UEFITool is based is somewhat old, so some motherboard firmware may not work. Also, there are some that come encrypted, in which case UEFITool cannot open them.
In short, if you want to make modifications to your motherboard image, downloading UEFITool is one of the best options available.
