I am trying 10.12.6 and meet the same problem, could you kindly tell me how to fix this? I am using UniBeast7 to create USB installer. No additional graphics cards.Hi, I have -x and -v boot options selected but it hangs and reboots here on the latest OS.
Thanks for a great guide!
Edit: I got eveything up and running by dropping in a GT710 GFX card!