Hello,
For your question, yes you need to update the bios, either with an old ryzen processor on the motherboard or update the bios with a USB stick containing the bios file downloaded from the manufacturer's website, then plug the stick into the bios flash port without a processor.
You need a headset with a jack plug for the microphone and another for the headphones, as the motherboard has several audio connections that are separate for the microphone and headphones. A headset with a single jack connector that combines both microphone and headphones will not work optimally as the motherboard has separate connectors for microphone and headphones.
BIOS problem. Try a total reset to reactivate the backup. This "total reset" is described in detail elsewhere. Possibly contact Gigabyte Support Germany. The employees are very competent.
I have a rev 1.3 and the 5700X ran straight away. However, I then also flashed the latest bios version.
I don't know if this is also the case with rev. 1.2.
I had to update the BIOS from version 10 to 15 with QFlash and a USB stick for a 5800X3D.
Download BIOS Updates: https://www.gigabyte.com/Motherboar...
IMPORTANT: Pay attention to your revision of the board. The link above is to Rev. 1.0/1.1.