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.
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.
Hello, I installed the board, inserted a Ryzen 9 5900, put the fan on it, switched it on and was done. Apart from refreshing Windows, nothing else was necessary. Everything hums fine.
It has a 24-pin ATX connection. Maybe you should mention which connector you mean...
Or you can look in the manual yourself, everything is wonderfully documented https://download.gigabyte.com/FileList...
This motherboard has a Bios Flashback, so you can update the bios without any processor, ram or graphic card.
Here is a a guide : https://www.youtube.com/watch