Graphic Glitches during Installer (5700XT, Ryzen)

Hey everyone, got some problems here.
I tried to install MacOS 10.15.1 on my system, USB stick seems to work but I can't install MacOS because of the graphic glitches I got, see photo.

My System:

• AMD Ryzen 5 2600X
• X470-I
• 16 GB RAM
• AMD 5700 XT
• Samsung 970 Evo Plus (updated to the newest firmware)
  

I'm using OpenCore 0.5.2, got the newest WhatEverGreen and Lilu kexts.

I used following boot arguments first:

• -v
• agdpmod=pikear (for 5700XT)

but got the glitches.

Then once without agdpmod=pikear, still glitches.

After that, I just paste everything in where I thought it might help with the hope it my solve my problem:

• -v
• agdpmod=pikear
• dart=0
• slide=0
• keepsyms=1
• -wegbeta
• -lilubetaall
• -vsmcbeta
• -alcbeta

still no success .

Have seen this is because of the 5700XT, I tried DP and HDMI but no success either. As I got no iGPU this might also not help. I still got a RTX2060, does this might work at least for the installation?

Can someone help?

Thanks in advance!

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https://preview.redd.it/2v25aocgwfx31.jpg?width=3264&format=pjpg&auto=webp&s=75fb36e554e5d99394c60ee3b00ac7c8c8cfa7cb