How to Resolve BOOTMISMATCH Error on Legacy Boot for macOS High Sierra

Hackintosh Guide: Fixing BOOTMISMATCH Error on Legacy Boot for macOS High Sierra

If you're encountering the BOOTMISMATCH error while attempting to install macOS High Sierra on an Intel Penryn system with legacy boot, follow these steps to resolve the issue:

1. Verify Legacy Boot Compatibility:

   • Ensure that your Intel Penryn system supports legacy boot and is compatible with macOS High Sierra. Check the system specifications and compatibility lists to confirm.

2. EFI Configuration Check:

   • Review your EFI folder configuration to ensure that it's correctly set up for your specific hardware and macOS version.
   • Verify that the config.plist settings, kexts, drivers, and ACPI patches are compatible and properly configured.

3. Legacy Boot Patch:

   • Apply any necessary legacy boot patches to your EFI folder to address compatibility issues with legacy booting.
   • Look for specific legacy boot patches or drivers that are recommended for your Penryn system and macOS High Sierra installation.

4. Update OpenCore or Clover:

   • If you're using OpenCore or Clover as your bootloader, ensure that you're using the latest version available.
   • Updating to the latest version may include fixes or improvements that address the BOOTMISMATCH error.

5. Boot Arguments:

   • Experiment with different boot arguments in the config.plist file to see if any specific arguments help resolve the BOOTMISMATCH error.
   • Adjusting boot arguments related to kernel, graphics, or ACPI may help in certain cases.

6. Verify macOS Installation Image:

   • Confirm that the macOS High Sierra installation image you're using is not corrupted and matches the version compatible with your hardware.
   • Consider redownloading or recreating the installation image to ensure its integrity.

7. Legacy Boot Settings:

   • Check the BIOS or firmware settings of your Intel Penryn system to ensure that legacy boot mode is properly enabled.
   • Verify that there are no conflicting settings in the BIOS that could affect the boot process.

8. Community Support:

   • Seek assistance from the Hackintosh community forums, Discord channels, or Reddit communities for additional troubleshooting help.
   • Experienced users may provide insights or specific solutions based on their own experiences with similar setups.

By following these steps and seeking assistance from the Hackintosh community, you should be able to diagnose and resolve the BOOTMISMATCH error encountered during the installation of macOS High Sierra on your Intel Penryn system with legacy boot. If the issue persists, don't hesitate to ask for further assistance from the community.