1 -Create a USB bootable
Use this tool and download Catalina or Big Sur from Apple servers
installScript_1016fullapp.zip
Credits: crazybirdy
Copy Catalina / Big Sur installer to Applications folder, open terminal and run
Catalina
Big Sur
Monterey
If you want check one step by step, check here
-Opencore Vanilla Tutorial
https://tinyurl.com/y2dmt5af
Dear @MaLd0n, I sent you the link to my "Send me" folder via PM, since it's on my private cloud and was too big a file for the upload function of this forum.
I'm running a Gigabyte H370 HD3 with an i5 8400 and a GeForce 1080 on 10.13.4 with supplemental update
So far I have a semi-working setup:
Sound via newest FakePCIID and FakePIID_Intel_HDMI_Audio and AppleALC
Accelerated Graphics via Nvidia Web Driver
iGPU for keeping the DGPU offline for most of the Des