Ensure your PSP is running a relatively modern firmware (Official or Custom).
You cannot use a European (ULES) save file with a US (ULUS) version of the game without using a conversion tool. The Legacy of PES 2010 on PSP pes 2010 psp save data
When searching for the best save data, look for "All-in-One" packs. These usually feature updated 2023/2024 season transfers, corrected kits for the English Premier League, and real names for the German Bundesliga (which was notoriously absent from the original game). Websites like PES Patch and various Reddit communities remain the best hubs for these legacy files. Common Troubleshooting Tips Ensure your PSP is running a relatively modern
PES 2010 has different ID codes depending on where the game was purchased. Common codes include ULES-01308 (Europe) or ULUS-10461 (US). Your save folder must match the ID of your game version. Common codes include ULES-01308 (Europe) or ULUS-10461 (US)