i am facing the same problem, I am using clover version r3751 after so many reboots this problem still there, should i need to re-download macOS again?
Should I delete kexts from 10.11 folder on EFI/Clover/Kexts?Do you delete the kext from the carpet 10.11 and put them in the Others?
Yes! Finally managed to upgrade to Sierra.
View attachment 211233
Enabled verbose and noticed that it stops with aplleHDA error.
Installed audio from this thread - http://www.tonymacx86.com/threads/sierra-desktop-realtek-applehda-audio.197923/
And after that booted fine and started install, after that updated nvidia driver and installed script for hdmi audio.