Catalina Install problem.

Looking for help to install MacOS Catalina on the computer listed below.

I have followed the Unibeast installation guide and can get up to step 4.
At the point where Catalina is to start installing, I get a black screen with
a white Apple logo in the middle of the screen and I get the following error
code on the motherboard display “AF”. Manual description is “Exit Boot Services”.

Anyone having a problem like this?

Motherboard - Gigabyte W480 Vision W Rev 1 LGA 1200 Socket with Intel W480...

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Author: oldmacuser