Sep 22, 2010 Best Answer: Like the guy above me said, you'll need a custom firmware and not an official firmware. 5.03 firmware is the magic firmware a PSP 3000 needs to play PSP iso games. It's unlikely the PSP you'll buy will have this firmware because it'll be up-to-date. Welcome to /r/PSP, a place to talk about everything PSP and PSPgo. Official /r/PSP Discord server. Latest Official System Software: 6.61. Guides and Resources /r/PSP's Wiki page. How to download PlayStation Store content to your PlayStation Portable. How to stream music using the RSS channel. How to connect your PSP to Wifi.