So i waited 10 days but got no answer, others well. Was the question too stupid? I really looked around before but just wasnt sure so I asked. XHCI still cant be enabled in my BIOS version and I cant install High Sierra (It just reboots after a short while over and over-> "the installer resourced have expired"). I found some threads on the forum and a lot of opinions like the idea of installing Sierra instead of High Sierra to solve the problem ... some said that high sierra in general can cause problems in the installation and they first installed sierra, then updated to high sierra, but I cant try this out as I dont own it and have no access to it :/ But thats only one idea what the problem is and Im not sure so I ask, as Im really new to all this and just wanted a quick information, what could be the solution to my problem