damed, I used both and nothing more. I'll start digging with the Graphics card (I have a GT 710 as alternative)
well nothing worked... can it be something related with the "vanilla" catalina installer or is it still with the EFI boot part ?
seeing all these errors makes me think I have a long way to go...
Well, i managed with a clean usb boot disk to moove to a new error, pointing at AptioMemoryFix.efi being outdated, then I saw that it could be removed by simply deleting OcQuirks files, but now it's generating a panik and reboot screen.
it happens so quickly that I did not manage to catch all the errors, but I still saw what seemed to be the first error
lilu user:0 failed to change memory protection (0,2)
and just after several :Error: failed to bootstrap path ... no such file or directory. I am going to look where it leads to... And will document my findings