High Sierra update freezes / no progession

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
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