Intel HD 5xx/6xx Graphics (Skylake & Kabylake) users:
There are changes to the new 10.12.5 Intel graphics drivers which may cause black screen or hang on boot. If you can't boot to desktop after updating, uncheck Inject Intel in Clover boot menu under Options/Graphics Injector/Inject Intel:
When you reach the desktop, install the following kexts to /Library/Extensions using
KextBeast:
Lilu.kext
IntelGraphicsFixup.kext
You may also install the kexts
before you update. The addition of these kexts should allow you to boot- we are looking into using Clover's KextstoPatch for a permanent solution.
Please post a reply if this has/hasn't worked for your system.
Source:
http://www.insanelymac.com/forum/topic/322239-pre-release-macos-sierra-10125/page-3#entry2418219