You're looking for a useful feature related to UFC Undisputed 3 on PS3, specifically for a 3.55 PKG file.
was the historic "golden firmware" that first allowed users to install custom packages (PKG files) without hardware modifications. Ease of Installation Ufc Undisputed 3 Ps3 3.55 Pkg
On the PlayStation 3, was the last version to have its private keys fully compromised. As a result, many jailbreak tools, custom firmwares (like Kmeaw, Rebug, Rogero), and backup loaders require a base of 3.55. A PKG file (PlayStation Package) is an installable format—similar to an official installer—that can be used to install games, homebrew, or DLC directly to the PS3’s internal hard drive without needing a disc or a standard backup manager. You're looking for a useful feature related to