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Custom firmware allows the running of unsigned code such as homebrew applications, UMD.ISO files, emulators for other consoles and PS1 games when the disc images are converted into an EBOOT file. [17] This is in stark contrast to the official system software, where only code that has been signed by Sony can run.
Soon after the PSP was released, hackers began to discover exploits in the PSP that could be used to run unsigned code on the device. Sony released version 1.51 of the PSP firmware in May 2005 to plug the holes that hackers were using to gain access to the device. [8] On 15 June 2005 the hackers distributed the cracked code of the PSP on the ...