I tried installing Big Sur on my Lenovo S340 [Intel i7-1065G7]. But I'm stuck on the

UEFI Shell startup.nsh part.

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I used IdeaPad-S340 these EFI files and added the GensmBios to them.

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https://preview.redd.it/kzjfoon1rq671.jpg?width=1280&format=pjpg&auto=webp&s=2707f78da4b66aa0e3249b8dfaab198227de6e81

https://preview.redd.it/ywrq8rn1rq671.jpg?width=1280&format=pjpg&auto=webp&s=f8d1897dd5feace52d0e2c26318c1d5fa1621cd0