Unzip the BIOS file that you downloaded.
You need three files and small USB 2.0 flash drive
HP USB Disk Storage Format Tool
Win98boot
BIOS file for your motherboard.
Files are available here:
https://www.gigabytenordic.com/flash-update-bios-gigabyte-fm2-motherboards-support-new-kaveri-apu/
You will be using the EFI Flash tool that is included in the BIOS .zip file.
First try out the USB drive after making the it a DOS startup disk. If you can boot into DOS your ready to go.
This guide uses rufus to make a DOS startup disk. You can skip that step. Follow the instructions using your motherboard BIOS file name and flash with the EFI flash tool.
(this guide discards the Autoexec file)...