How to Fix MacOS Big Sur on Legacy system
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
- Boot with
-v keepsyms=1 debug=0x100to identify the exact kernel panic. - Validate your config.plist using ocvalidate.
- Ensure your EFI matches the Dortania guide specifications for your CPU generation.
Verification
- Reboot and verify if the functionality is restored and stable under typical usage.
Original Question:
Hello
I've recently installed macOS Catalina on an LGA 775 system with an Intel Core 2 Quad Q8400, everything works fine but I wanted to upgrade to MacOS Big Sur, I've made a first attempt to boot with OpenCore but I get an error "Boot mismatch" and nothing after, so I've tried with clover, and it worked just fine, but when I get to the installer my keyboard and my mouse doesn't work at all, I'm not excepting USB not to work because the USB can boot into the installer, and I've tried...
Read more
I've recently installed macOS Catalina on an LGA 775 system with an Intel Core 2 Quad Q8400, everything works fine but I wanted to upgrade to MacOS Big Sur, I've made a first attempt to boot with OpenCore but I get an error "Boot mismatch" and nothing after, so I've tried with clover, and it worked just fine, but when I get to the installer my keyboard and my mouse doesn't work at all, I'm not excepting USB not to work because the USB can boot into the installer, and I've tried...
Read more
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