Playing Plants vs. Zombies on PSP requires a fan-made homebrew port, as the game was never officially released for the handheld. Users can download the AlexDev2 edition and install it by moving the extracted files to the PSP/GAME folder on a CFW-enabled PSP. For more details, visit CDRomance . Will there be a Plants vs. Zombies game on PSP? - GameFAQs
Copy the entire game folder (the one containing the EBOOT.PBP ) into ms0:/PSP/GAME/ . plants vs zombies psp cdromance install
On your PSP, exit USB mode. From the XMB (home screen): Playing Plants vs