EDM-033 2 Second BLOD / can't find the issue

Hi,

I have a EDM-033 Motherboard, I attached a UART and I get the Error 80810001

Which just says Power Sequence Error -_-

I changed the PSU and cleared the UART codes yet the Ps5 behaves the same.

I have tried alot of components with a Multimeter in continuous mode and everything seems to be fine.