Open a AMD Warranty ticket and ask for a AMD BOOT KIT to be sent to you. It is a processor with a CPU Cooler in which you install and update the BIOS then you send the Boot Kit back to AMD.
Here is where you can ask for a Boot Kit: https://www.amd.com/en/support/kb/faq/pa-100
But before you order the AMD Boot Kit make sure you need a BIOS Update for your Motherboard. It might have the correct BIOS version installed.
If you don't know which BIOS version you have installed open a Gigabyte Support ticket and give them your Motherboard's serial number and they will be able to tell you which BIOS version your motherboard originally came with when you purchased it.