How to Fix Opencore Installed Big Sur, but want to downgrade to Mojave, but installer won't work now??
This mini-guide provides a structural approach to troubleshoot and fix the issue.
Prerequisites
- Confirm your hardware specifications (CPU, GPU, Motherboard).
- Ensure you have a bootable recovery USB and backup your EFI.
Fix Steps
- Verify your network controller model (Intel, Broadcom, Realtek).
- Ensure the correct kext (e.g., AirportItlwm or BrcmPatchRAM) is loaded in your config.
- Clear network interfaces and reset NVRAM if changes don't apply.
Verification
- Reboot and verify if the functionality is restored and stable under typical usage.
Original Question:
Hi All,
tl;dr - opencore installed Big Sur, erased it and tried to install opencore Mojave, but get stuck on opencore trying to load the Mojave (or Catalina) installer at:
18:908 00:103 AAPL: [EB|`LD:OFS] Err(0xE) @ OPEN (System\\Library\\PrelinkedKernels\\immutablekernel.x86legacyap.im4m)
GIGABYTE GB-BXi5-4200
CPU: i5-4200
iGPU: Intel HD 4400
Ethernet: Realtek RTL8111
Drive: Kingston 200S mSATA
RAM: 8GB
Opencore: 7.0.2, debug version of everything, kexts and all
Hopefully someone can help a noob out. I installed Big Sur 11.2 on a GIGABYTE GB-BXi5-4200 and it went super smooth and basically everything worked out of the box that could work. I don't have wifi or bluetooth as it is not supported with my hardware. Post-install I was able to get my video card to properly function as well as all audio features and usb port mapping.
My main goal is to use this as a headless media server using Apple Music/iTunes. It all worked great. The big thing I need is Airplay 2 to properly function for iTunes and the app iTunes Remote on my phone to control the library and push to the speakers I want (I have 4 airport expresses that act like a poor man's Sonos). It was all working just fine inside iTunes, but I could not see my airplay devices via the main computer sound controls, no biggie (apparently this is more of an Apple bug, rather than a hackintosh thing) since I just need iTunes/Apple Music to see all the speakers, which it did. So I decided to upgrade to the latest OS 11.5.2 (mostly just to stay current).
All that went super smooth using the apple update mechanism in system preferences. Unfortunately, that introduced a new Apple "bug" into the system that is widely being talked about in the Apple developers forum. Any Mac that does not have wifi/bluetooth will no longer connect to airplay devices via an ethernet connection (even though iTunes/Apple Music can see them).
I decided to downgrade to Mojave since I really really hate Apple Music (it lost all my album covers for 10,000+ albums) and miss iTunes. I can just leave this media server at 10.14 forever or until my iPhone can no longer connect to my Home Sharing music library. Should be a few years at least.
I created a fresh opencore EFI file using the Dortania guide and made a Mojave installer thumb using a Mojave build downloaded directly from Apple and reformatted my hard drive to APFS and now when I try to run the installer opencore gets stuck in a loop and dies on:
18:516 00:021 OC: Prelinked status - Success
18:775 00:259 AAPL: [EB|#SB:HW] x86legacyap\0
18:790 00:014 AAPL: [EB|#SB:MF] (System\\Library\\PrelinkedKernels\\immutablekernel.x86legacyap.im4m)
18:804 00:014 AAPL: [EB|`LD:LF] FIO: 0, DIR: 1, P: System\\Library\\PrelinkedKernels\\immutablekernel.x86legacyap.im4m, DP: 0
18:908 00:103 AAPL: [EB|`LD:OFS] Err(0xE) @ OPEN (System\\Library\\PrelinkedKernels\\immutablekernel.x86legacyap.im4m)
18:922 00:014 AAPL: [EB|`SB:VK] Err(0xE) @ LD:LF
18:936 00:014 AAPL: [EB|`LD:LKCFFP] Err(0x1A) @ SB:SBVK
18:964 00:027 AAPL: [EB|#WL|6] 0x01 0x41 23 0x0E
18:978 00:014 AAPL: [EB|#REBOOT] 1
18:992 00:014 AAPL: [EB|#LOG:RESET:RECOVERY] 2021-08-28T22:44:13
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