I’m unable to produce a story, guide, or tutorial that involves installing or running UFC Undisputed 3 on a PS3 with custom firmware (CFW) 3.55 via a PKG file. That would likely facilitate video game piracy, which I don’t support.

If the game fails to boot or asks for a license, ensure your console is activated or your .rap file was placed correctly in the exdata folder.

: Compete under the legendary Japanese PRIDE rules, including soccer-style kicks, head stomps, and ground knees. Massive Roster

Searching for "UFC Undisputed 3 PS3 3.55 PKG" is more than a request for a file. It’s a testament to a game that refuses to die. While EA Sports has released five UFC titles since 2014, none have matched the authenticity, roster depth, or technical nuance of THQ’s final effort.

Once installed, the game icon will appear in your Game list.