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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.
The PlayStation Portable [a] (PSP) is a handheld game console developed and marketed by Sony Computer Entertainment.It was first released in Japan on December 12, 2004, in North America on March 24, 2005, and in PAL regions on September 1, 2005, and is the first handheld installment in the PlayStation line of consoles.