I change all settings but still game flashing, and some times so fast I can't play.
When you look up to the sky all screen just starts Flashing
Some times when I change to Ratio to 5x4 it's gone but when I Start playing it's back
What are your computer's specs? First thing first, make sure you've installed the latest drivers for your video card. If on laptop, make sure game is using Geforce GPU rather than Intel iGPU.