The vanilla version of PES 2013 on PSP is frozen in time. By downloading "Extra Quality" save data, you effectively turn your PSP into a modern football machine.
The Ultimate Guide to PES 2013 PSP Save Data: Unlocking "Extra Quality" Performance pes 2013 psp save data extra quality
Finding these files is an adventure in itself. The PSP uses .SAVEDATA folders (often named something like ULES015100000 ). The vanilla version of PES 2013 on PSP is frozen in time