Can not install Big Sur - a gray screen...

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