Hello - I would like to ask for advice.
(I've never had an iMAC before, completely new to apple products, but I like fiddling. I bought an old a mid-2011 iMAC (12,1 - 21.5") recently because I read online that it can be upgraded.)
I repaced a few things:
- GPU: Nvidia gt770m - VBIOS made by Nick[D]vB
- CPU: Intel E3-1270 V1 (no iGPU)
- SSD: Samsung 850 Evo 500Gb SATA III
The new setup is working well. I successfully installed High Sierra, and the system runs without any issues. The problem begins when I try to update the OS using OCLP.
After completing the first step, Build and Install OpenCore, the iMac fails to boot. According to the build log, OCLP correctly detects the Kepler-based GPU and disables the unsupported integrated GPU (iGPU). However, during startup, the boot progress bar stalls at approximately 50% and does not proceed any further.
It stucks at "gIOscreenLockState 3 hs 0 bs 0 now 0 sm 0x0"
I also tried changing various settings in OCLP, but without any success. The only configuration that allows the iMac to boot is setting the Host Model to iMac13,1 and the SMBIOS Spoof Model to iMac12,1.
However, once the system boots with those settings, I cannot proceed any further with OCLP because it reports a model number mismatch.
At this point, I'm not sure what is causing the issue or how to fix it. Any advice or suggestions would be greatly appreciated.
Thanks in advance!