Blackscreen OC 0.7.6, ASUS Z490

I'm trying to install Big Sur on my PC (see account hardware). I use OpenCore 0.7.6 and the Dortania guide for desktop Comet Lake config.
I select Install macOS Big Sur (external) in OC menu. When the Apple logo is going to appear the screen gets black (no video signal).

What I tried:
1) AAPL,ig-platform-id 07009B3E and 00009B3E
2) BigSur and Catalina
3) iMac20,1 and iMac19,1

- EFI folder (removed)
- last loading screen

Please, help. Thanks.

P.S. It...

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Author: MagTux