The most verified file is the one you create yourself. If you own the physical disc:
Once you have tracked down a verified PKG (typically from established PS3 scene forums—we will not link directly, but you know where to look), follow this installation guide.
The r/ROMs community maintains an extensive, updated Megathread with links to verified console backups. For PS3 PKG files, they direct users to archive.org and Myrient.
