Dma Card makes pc unable to boot

So I bought a cheap dma board from Amazon (stark dma 75t). I have tried to make my own fw on it I have followed every guide etc. but when I install my firmware and restart the main pc, it hangs endlessly in the mainboard loading screen or when windows starts I have 1 frame robotic audio and you have the feeling I'm playing on a fridge ;) when I do a speedtest it is even very good! I have no idea what exactly triggers this or what I need to change on my fw. With the standard Pcileech Capitain Dma 75t firmware everything works fine so I assume it's the firmware.

I have a pc with a 4070 super and ryzen 9750x3d so it shouldn't be the pc!
I have also tried to expose usb ports, but that didnt help either
With kind regards :D

So I have now changed something on my firmware, which now ensures that the Pc boots and everything runs smoothly but after a few seconds I get a blue screen

stillstandcode: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
Fehlerursache: cthdb.sys

With kind regards

Try an open-source firmware to troubleshoot. If still an issue, could try a fresh install of windows on a disk to see if same outcome to verify not an OS/Application problem. If it's still failing, might be DMA hardware.