UFC Undisputed on the PSP saved data in a proprietary format specific to the game and the PSP. The save data includes:

PSP save files are vulnerable to corruption or loss due to:

Backup recommendation: Copy the save folder from your PSP’s PSP/SAVEDATA/ directory to a PC, cloud storage, or external drive.

The base game typically includes only modern (for the time) fighters like Georges St-Pierre and BJ Penn. Locked legends include:

A good savedata file unlocks every single fighter from the get-go.

On PSP, save data is everything. Careers, unlocked moves, created fighters and their appearance, and progression of championships are all stored in a small file on the Memory Stick. For many players the PSP’s portability encouraged short sessions, but career modes could still take dozens of hours; losing a save due to corruption or accidental deletion could be devastating. That necessity made backups, exports, and file-swapping common habits in the community.