How to Correctly Install OpenCore Legacy Patcher to Internal Disk on MacBook Pro 2012 A1278

How to Install OCLP Bootloader to the Internal EFI System Partition

When installing modern versions of macOS on a MacBook Pro Mid 2012 (A1278) using OpenCore Legacy Patcher, users often encounter an issue where the patched OS will only boot when the installation USB is connected. On reboot, the internal drive boot option does not appear. This is caused by failing to install the OpenCore files to the internal disk\'s EFI partition.

1. Prerequisites

• Target Hardware: MacBook Pro 13-inch Mid 2012 (A1278, MacBookPro9,2).
• Required Tools: OpenCore Legacy Patcher application.

2. Compatibility Snapshot

• Supported versions: macOS Ventura, Sonoma, and Sequoia run well on A1278 models after applying OCLP graphics root patches.

3. Installation Preparation

1. Boot from USB: Connect the installer USB, turn on the Mac while holding the Option key, and select "EFI Boot" with the yellow OpenCore icon to boot into macOS.

4. EFI and config.plist Review

1. This does not apply to this case because OCLP manages the compilation of the EFI folder automatically based on the detected MacBookPro9,2 hardware profile.

5. Post-Installation

1. Install OpenCore to Internal Disk: Open the OpenCore Legacy Patcher app. Click on Build and Install OpenCore.
2. Select target drive: Click Install to disk, and select the internal SSD/HDD of your MacBook Pro. Select the EFI partition (usually Partition 1).
3. Apply Root Patches: Apply the post-install root patches to restore Intel HD 4000 graphics acceleration.

6. Troubleshooting

Reported Issue: Internal EFI boot option missing

1. Hold Option Key: Shut down the Mac, remove the USB drive, turn it on while holding Option, and select the grey "EFI Boot" icon. Once selected, it will write the default boot variables to the NVRAM.
2. Reset NVRAM: If the option still does not appear, perform an NVRAM reset to clear stale boot definitions.

7. Dual Boot and Advanced Configuration

• This does not apply to this case because the bootloader installation only modifies the EFI partition of the system drive.

8. Verification, Maintenance and Rollback

• Verify fix: Ensure the MacBook Pro boots directly to the macOS desktop without the USB installer connected.

9. References and Glossary

• A1278: The model number for 13-inch Unibody MacBook Pro models produced between 2009 and 2012.