If you run CWCheat, you can add these hexadecimal codes to your database to alter Career Mode parameters:
Unlike older arcade fighting games, UFC Undisputed 2010 does not feature a traditional cheat menu where entering a password gives you infinite health or maximum stats in Career Mode. THQ designed the game to protect the competitive integrity of the single-player campaign.
The career mode on PSP is a remarkably faithful, albeit slightly stripped-down, port of the console version. While it lacks commentary and some visual polish, it offers a deep 12-year progression system where you lead a custom fighter from the World Fighting Alliance (WFA) to the UFC Hall of Fame. Career Mode Review
A major criticism is the rapid stat decay. If you don't constantly spar or train, your fighter's attributes drop, which some players find tedious.
At the main menu, press Up, Up, Down, Down, Left, Right, Left, Right, X, O . A sound cue will confirm the unlock.