Bios access issue X570S PG Riptide

Hello everyone,
I have an ASRock X570S PG Riptide and I can't access the bios settings, I tried several things but unfortunately without success:
With a ps2 keyboard, with a USB keyboard on the usb2 port, with just one memory stick (I tried with the 4 I have), with the "restart to uefi" application, but nothing worked.
When I try to go into the bios the system always freezes, no boot.
Otherwise the system works fine when I don't try to go into the bios (Windows 10 boots quickly, occt tests work without problems, etc....)

I also tried to update the firmware to version 1.50 (with the BIOS Flashback button), the update was successful but again no possibility to go into the bios: the system is still blocked.
I am obliged to turn off the power supply to be able to restart Windows.

My configuration:
Ryzen 5900x
32GB of Crucial Ballistix BL8G30C15U4B.8FE (4*8)
GeForce Gtx 1060
Sandisk nvme
680w Bequiet

Thanks in advance for your help

Have you tried disconnecting all devices from the system except for keyboard and
display?
Some USB devices can cause the BIOS to hang/freeze. I have also seen it happen with
some SATA devices (Optical drives and hard disks etc).

Jo widow, die you got any new informations, bcs i got the same problems for my Computer. I tride every possible key combination and the solutions from the forum but nothing worked.

That would possibly be a good thing but to do that I need to get into the bios system first and I can?™t even get into the bios overview. I also dont have an operating system installed. Do you have any other ideas I?™m a little bit clou less.