The "All Star Yakyuken Battle" series (also known as All Star Janken Battle ) consists of Japanese-only titles for the PlayStation Portable that famously blend traditional rock-paper-scissors gameplay with adult-oriented content featuring popular Japanese idols. Running these titles on a —a console without a physical UMD drive—requires specific Custom Firmware (CFW) and digital management. Understanding the All Star Yakyuken Series
: Ensure your PSP Go is running on official firmware 6.60 or 6.61. You can update this via Wi-Fi or by placing an EBOOT.PBP update file in PSP/GAME/UPDATE/ . Install PRO-C or LME : All Star Yakyuken Battle Psp Go Custom