The PSP modding community is incredibly resilient. Instead of playing old PS1 graphics, talented modders take later PSP titles—such as PES 2014 or PES 6 for PSP—and completely overhaul them.
The Evolution of Portable Football: Remembering Pro Evolution Soccer on the PSP pes 2002 psp
To play this converted title, users needed to run a custom firmware—such as the famous "3.40 OE" (Open Edition) by developer Dark_Alex—which allowed unsigned code to execute on the PSP. The installation process was straightforward: users would download the converted game folder and copy it into the PSP/GAME directory on their Memory Stick Duo. The PSP modding community is incredibly resilient