@remington, are you using the latest BIOS? I'm trying to switch over to OC, but I'm having lots of difficulties. I used the EFI folder that you posted, which worked for High Sierra, but I couldn't get it to boot Catalina, or Monterey. I tried to set up an EFI folder myself but it went up in flames, too. It wouldn't boot Monterey, and, when I tried to boot into HS, it booted into recovery in Russian? language. And, when I booted into HS with Clover, my Nvidia graphics don't work with acceleration anymore even after an NVRAM reset. I'm wondering if it's an NVRAM issue with the latest BIOS? Might also be because I have a 9 month old, and I'm doing this during his nap times.