EFI folder for my 27" iMac11,3 from 2010. It's based on the EFI generated by OCLP but with a few tweaks to suite my requirements. All unnecessary have been removed (so don't use this for running macOS 12+)!
Supported macOS (with this GPU and WiFi/BT Card): macOS Big Sur
Note
Requires Post-Install Root Patching with OpenCore Legacy Patcher to re-enable GPU and Wi-Fi.
OC Version: 1.0.0 nightly
Model: iMac11,3 Mid-2010 A1312 base model
| Component | Description |
|---|---|
| OC version | 0.9.8 |
| OCLP version | 1.2.0 |
| CPU | Intel Core i7-870 (upgraded from i3-550) |
| GPU | ATI Radeon HD 5670 (512 MB) |
| RAM | 16 GB DDR3 by Samsung (1333 Mhz) |
| Storage | Kingston 120 GB SSD with custom-made, 3d printed disk mount. |
| Ethernet | Broadcom BCM5701 |
| WiFi | Atheros AR 9280 |
| Bluetooth | Broadcom BCM2046 |
Since this iMac would require a GPU upgrade in order to run anything the newer than Big Sur properly, a lot of kexts present in the EFI generated by OCLP are not required. So I removed them, thereby reducing the amount of injected kexts from 20 to 11! See details below.
- Deleted Kexts unnecessary for running macOS Big Sur and older:
Original Modified 
- Uses latest nightly OpenCore and Kext builds
- Changed default BG Color to grey because that's what real iMac 2010 uses.
- Download repo as zip
- Extract it
- Mount your EFI partition
- Copy
OCfolder toEFI/EFI(same location as the "APPLE" folder) - Copy
Systemfolder toEFIpartition root - Reboot
- Official Instructions: https://support.apple.com/en-us/HT204592 (only supported up to macOS 10.13)
- Triggering TDM manually: https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-662?post=30468890#post-30468890
Results: https://browser.geekbench.com/v5/cpu/22028275
- Acidanthera for OpenCore and kexts
- Dortania for OpenCore Legacy Patcher and Guide