Olarila is a community that creates preconfigured macOS images (often modified or “custom” installers) for running macOS on non-Apple (PC) hardware — commonly called Hackintosh builds. The “Olarila Monterey 12.1.raw” file you mention is likely a disk-image/raw installer distribution for macOS Monterey 12.1 prepared by that community.
from the Olarila database that matches their motherboard series (e.g., Series 300, 400, 500). Key Technical Details for Version 12.1 Build Number : The specific version for 12.1 is Build Download Method : Most Olarila images are shared via olarila monterey 12.1.raw download
: Mount the USB's EFI partition and paste the Olarila EFI folder that matches your hardware. BIOS Settings Secure Boot and set SATA mode to Overview — Olarila macOS Monterey 12