ChickHEN works as a homebrew enabler for all PSP models (1000, 2000 and 3000) and allows execution of homebrew games and apps on 5.03 Official firmware. It can allow you to play games such as Bugz, Jellycar or run apps such as PSPFiler and PSPTube. Homebrew enhances the experience of a normal PSP without any faulty side-effects.

http://davee.x-fusion.co.uk/