This will help
http://forums.tweaktown.com/gigabyte/27576-bios-flashing-how-qflash-guide.html
Look at the bootable USB and follow that instructions. However, my note to you that the new BIOS is not really stable, you might have different problems after flashing (mine is 2 USB ports don't work anymore), so flash it with cautions. Also, remove all the Gigabyte software before flashing new BIOS according to the note from Gigabyte as they might have conflict with new UEFI bios. Once you in this, you cannot go back to your old hybrid F.12 BIOS because there is no official way to do that right now; however, you can search for unofficial way but it is risky to try and you might end up damaging your board.