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

[Messa]

Hi sorry for the late response.
Attaches screenshots ...
The verbose moments before it goes back to the Apple logo, there is a photo of it as well. And also attaches an image of the gray screen.
Hope everything is clear enough.

I got the same problem - Use other port for you display - i use instead of display port hdmi and it works.
Maybe unplug and replug it after it get stock.