@headkaze :
The Flashrom 1.2 Utitlities, which are attached to the start post of >this< thread, seem to work with my ASRock X570 Pro4 mainboard, although the in-use BIOS 4.20 contains the latest AGESA 1.2.0.3 Patch C modules.
As you can see here, I was recently able to let the Flashrom 1.2 create a BACKUP of my mainboard’s current BIOS Region:
What I haven’t yet tested is flashing of a modded BIOS by using the Flashrom 1.2 Utilities.