Hi, I really hope someone can help me. I started the HS update within Sierra and it constantly freezes with hfs: unmount initiated on Macintosh SSD on device b(1, 2) Screenshot My hardware: i5-7600k Z270 Board GTX 1080 I'm using the iMac15,1 SMBIOS and have updated my Kexts and added the latest apfs.efi What I tried: Removed all Kext and used a vanilla clover config Injecting Intel GPU and removing my external GPU completely Starting the installation without APFS conversion Starting from USB Using iMac18,X SMBIOS I can't believe this update is so complicated ... thanks a lot for your help. submitted by /u/lolderpilz [link] [comments] [► Source]