Hi, I am currently using macOS Catalina 10.15.7 with my system EFI folder provided by this page. I have tried to install macOS Big Sur by updating, using USB, with different EFIs, with clover and with opencore, and nothing worked. Is there any EFI to properly install macOS Big Sur on my system? I have a Lenovo Yoga 520 14IKB Intel Core i3 HD Graphics 620