Back with some more news.
I reinstalled the hybrid and now without any changes to cable etc it continues with diskless setup.sh
AND IT WORKS
Only thing a changed is the internal ip address range from 192.168.80 to 192.168.1 because I saw some post mentioning that but cannot find the reason anymore why people did that....don't think this is the cause though?
Probably due to bad install it didn't work...