How to Fix ASUS X99 Boards - Big Sur (Not Compatible)

By Big Sur
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How to Fix ASUS X99 Boards - Big Sur (Not Compatible)

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

  1. Boot with -v keepsyms=1 debug=0x100 to identify the exact kernel panic.
  2. Validate your config.plist using ocvalidate.
  3. 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:

Me and numerous other people have tried to get Big Sur working on ASUS X99 Boards. MSR (CFG Lock) Patched or not, doesn't matter. RTC Patch or not, doesn't matter.

You will most likely get a CR2 Error, I have seen many threads discussing this error and nobody seems to be able to provide a solution to it. I asked on discord about it and after having tried many possibilities, here is his conclusion:

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Author: chibibowa

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