You might need to create a USB SSDT. Try following this guide:
https://www.tonymacx86.com/threads/a-beginners-guide-to-creating-a-custom-usb-ssdt.272505/
Try downloading macOS Catalina from the App Store. You just won't be able to use Unibeast to create your USB. Use this guide instead:
How to Create a macOS Catalina Installation USB
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