After creating the bootable USB, when booting from it there is a solid cursor and nothing happen.

I followed this tutorial ( https://www.tonymacx86.com/threads/unibeast-install-macos-high-sierra-on-any-supported-intel-based-pc.235474/ ) and finished step 2, when I plug the USB to boot the computer, I press F8 to boot from the USB but a solid cursor appears and nothing happens. Any ideas what it may be going wrong in here?