STRANGE / INVERTED SCREEN COLORS [SOLVED]

(Please read this post even if you don't have my same PC, this solution might work in total different configurations).

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English is not my mother language, i'm sorry if there will be some errors. Thanks!

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STRANGE SCREEN COLORS

MY PC SPECIFICATION:

• MODEL - OPTIPLEX 3050 MICRO
• OS - macOS Big Sur 11.4 (I think that this problem might occur on other versions too)
• BOOTLOADER - OPENCORE 0.7.1
• CPU - Intel Core i5 7500T
• iGPU - UHD 630

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MORE INFO IN MY GUIDE, THERE IS MY EFI FOLDER AND SOME OTHER INFORMATION

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PROBLEM:

I did a successful installation of macOS Big Sur 11.4 but when it boots up the screen appear like in the photo and the system look like a little bit laggy.

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SOLUTION:

I changed the "SystemProductName" form "iMac18,2" to "iMac18,1". (This is specific for my configuration, for you maybe it will be some different model).

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NOTES:

In the Dortania Guide, under your CPU type, check what is the model suggested.

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That's all! I hope i help somebody even if this is a simple solution. If you have some questions or something else to ask i'm here to answer. Thanks!