HP DL380 Gen10 Error: 0xc0000001

[NiKiZe]

HP are actually quite good at dealing with these issues, have you contacted them?
I can guarantee you that it is harder for them to fix the issue, if they don't get your report.

building iPXE with DEBUG=memmap, might give you some idea of what is going on, and playing around with order of loading the files might help.
Also try to double check BIOS settings, maybe do a factory reset and try again and see if that changes anything.