The 3700X works with every bios version. I had 1.2 on it. At first, only the CPU and RAM LEDs were flashing. Then I pressed the "Clear CMOS Button" and it worked.

I also had Bios 1.2 on it. No problem with the 3000 Ryzen, they are all supported. I was shaking with my 5600x, but luckily it was recognised.

Thanks for the answer! Then I'm reassured, I was a bit afraid that it won't work.