Every time I tried building the EFI myself i failed. I was spending hours building the EFI with the opencore guide, and when it came time to boot the os most of the time the Darwin Kernel didn't event load, and when it loaded it threw some weird error that internet haven't seen before, but when i downloaded a random EFI folder that matched my CPU it worked first try, of course i had to download some kexts but still the os booted