MacOS Big Sur on Legacy system

I've recently installed macOS Catalina on an LGA 775 system with an Intel Core 2 Quad Q8400, everything works fine but I wanted to upgrade to MacOS Big Sur, I've made a first attempt to boot with OpenCore but I get an error "Boot mismatch" and nothing after, so I've tried with clover, and it worked just fine, but when I get to the installer my keyboard and my mouse doesn't work at all, I'm not excepting USB not to work because the USB can boot into the installer, and I've tried...

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Author: TK2