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