How to Fix Can not install Big Sur - a gray screen...

By Big Sur
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How to Fix Can not install Big Sur - a gray screen...

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. Check if your GPU requires WhateverGreen or specific boot-args (e.g., agdpmod=pikera).
  2. Ensure Metal acceleration is fully supported for your macOS version.
  3. Update Lilu and WhateverGreen to the latest versions.

Verification

  • Reboot and verify if the functionality is restored and stable under typical usage.

Original Question:

Hi, everyone.
I'm trying to install MacOS Big Sur on my desktop. (I was in High-Sierra for years but decided it was time to move on but my GPU does not support so I have to use my iGPU.)
My problem is:
While the installation is starting I come across a gray screen with a mouse. And that's it.
I tried to change things and ... nothing helped.
Attaching my EFI, I'm using OpenCore.
My hardware:
Motherboard: GA-Z270X-Ultra-Gaming
CPU: i5 7600K
iGPU: 630
GPU: GTX 1060 6GB - I know it does not...

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Author: Itay1778

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