PSP ISO requires direct hex editing or reverse engineering the MIPS assembly code. Because this is a compiled, proprietary ISO file running on dated handheld architecture, you cannot add features using standard game development engines.
Pro Yakyuu Spirits 2014 is a professional baseball game developed by Diamond Head and published by Konami. This game is part of the Pro Yakyuu Spirits series, known for its realistic gameplay and features. The game was released in Japan in 2014 for the PlayStation Portable (PSP) handheld console. Pro Yakyuu Spirits 2014 PSP -JPN- ISO -v2.00-
It is important to note that There is no English localization. Developing a new feature for the Pro Yakyuu
Overriding the 2014 Nippon Professional Baseball rosters with current-day players. This game is part of the Pro Yakyuu