are you booting from the correct drive i had the same problem until i found i was not booting from the correct EFI image if not
try building a new EFI using this tool from github
it works well for me and simple to understand
Beiträge von moody
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https://github.com/lzhoang2801/OpCore-Simplify
i have just built a new opencore EFI using OpCore-Simplify
it is working very well no issues as yet
