Ensure your PSP is running Custom Firmware (like PRO-C or ME).
emulator on Android or PC. A "highly compressed" version typically refers to an ISO file that has been converted or trimmed to save storage space without losing core gameplay functionality. Key Features of (PSP Version) Genre & Gameplay : A deep soccer simulation developed by featuring 1–7 local players and up to 8 players online. Updated Content pes 2012 psp iso highly compressed