(you will have to flash the motherboard before it accepts the 5600X CPU unless it comes flashed out of the box. It will need power and you'll need a USB stick to install the new BIOS)
We cannot know what version of BIOS is installed on the motherboard. It left the facotry some time ago. BIOS cannot be updated when the motherboard is still in a box, unsold.
The CPU is newer than the motherboard, so you will probably have to flash the BIOS before the CPU will work.
I say probably because maybe the motherboard isn't so old and it has a more up to date BIOS. BIOS version F10 is required for that CPU. Latest BIOS is version F18.
You have to download BIOS version F18 (
available here).
Then take a USB and format it to FAT32. This will wipe all the files from the drive!!!
Do not format the USB drive to NTFS or exFAT. Make sure it's FAT32.
Then extract the downloaded BIOS file to the root of your flash drive, and rename it to GIGABYTE.bin
Use this USB stick to flash the BIOS on your new motherboard. plug it in, try to start the PC and wait.
Depending on motherboard model there may be some LED indicator.
Typically, the computer will start but it will not display anything. After a while the flashing process will begin. It lasts about 30s to 2 minutes.
After the flashing is complete, your PC will restart or shut down.
It might restart a few times. Just be patient.
Do NOT restart your computer manually while flashing is in progress. Thankfully, it is Q Flash Plus capable so BIOS can be restored if corrupted.
Once you get a new BIOS, the motherboard will be able to run the CPU and your PC will attempt to POST and enter BIOS where you can make changes if you need to. You should install Windows and ensure everything is running properly before enabling XMP/EXPO.
If you have more than one drive, do not connect any except the drive you're installing Windows to. Avoids problems with Windows setup and Boot order.
After Windows is installed, shut down the PC and reconnect other drives. Pain in the ass with NVMe drives, but what can you do.
You can read more instructions in your motherboard manual and these pages:
(scroll down to Ultra Durable and the QFlash info/video)
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https://www.gigabyte.com/Motherboard/B550-GAMING-X-V2-rev-10-11-12#kf
(scroll down to where it talks about DualBIOS and Q Flash Plus)
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https://global.aorus.com/blog/How-to-Update-Your-BIOS-Part-2.php