Booting to black screen after Update
Sys def: iMac 17,1
GPU: RX580
IGFX as initial display
No graphic kexts applied.
Tried GFX0 to IGPU, fake ID for 6700k and RadeonDeInit with no luck.
Works when I boot with my USB-Installer EFI, which has iMac14,2 as System Definition. But then it shows 2x...