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I see that some of the members have a similar system to mine. For example @etc . Can you share the EFI with me so I can make the necessary progress?

I have a site that works fine with opencore and catalina. After installing Big Sur, the system only displays on the external HDMI screen. There is no screen on the laptop monitor. It seems to be stuck on the loading screen, but when you plug in the HDMI cable, you get a picture on the external...