How to Fix Windows Boot Issues After NVRAM Reset on OpenCore (Hackintosh Guide)

Have you reset your NVRAM on your Hackintosh running OpenCore and now Windows won't boot? Don't worry! This is a common issue, especially in dual-boot setups. When NVRAM is reset, Windows boot settings can get lost, causing boot issues. Here's how to fix it using the BlessOverride setting in config.plist.

Understanding the Issue: NVRAM and Boot Settings

NVRAM (Non-Volatile Random-Access Memory) stores essential boot configurations. Resetting it can disrupt OpenCore's ability to locate Windows boot files, particularly in multi-OS setups.

Solution: Configuring BlessOverride in config.plist

The key to resolving this is the Misc -> BlessOverride setting in config.plist. This guides OpenCore to the Windows bootloader.

Step-by-Step Guide:

1. Open config.plist: Use ProperTree or another plist editor. This file controls your OpenCore setup.
2. Navigate to Misc -> BlessOverride: Locate this section in your plist.
3. Add a new string value: Input the path to the Windows bootloader.
4. Enter the correct path: Typically, this is \EFI\Microsoft\Boot\bootmgfw.efi.

Example config.plist snippet:

<key>Misc</key>
<dict>
    <key>BlessOverride</key>
    <array>
        <string>\EFI\Microsoft\Boot\bootmgfw.efi</string>
    </array>
    ...
</dict>

Why This Works

The bootmgfw.efi is the Windows Boot Manager. By adding its path to BlessOverride, you direct OpenCore to the Windows bootloader, ensuring it can find it even after an NVRAM reset.

Important Tips

• Mount your EFI partition: Access your EFI partition to edit config.plist.
• Double-check the path: Ensure the path is correct to avoid issues.
• Save your changes: Don't forget to save config.plist after editing.
• Reboot: Restart your Hackintosh to apply the changes.

Troubleshooting

If you still encounter problems:

• Verify boot order in BIOS/UEFI: Ensure OpenCore is set as the primary boot option.
• Check your Windows installation: There may be issues with your Windows setup.
• Consult OpenCore resources: Use OpenCore documentation and forums for additional help.

By adding \EFI\Microsoft\Boot\bootmgfw.efi to BlessOverride, you create a direct link for OpenCore to the Windows bootloader, ensuring a smooth boot experience even after an NVRAM reset. This should help you get back into Windows quickly and easily!