Judging by an internal time stamp, it was likely compiled on September 3, 2009.

The released prototype is the last known build compiled prior to its cancellation. Renaming BOOT.BIN to EBOOT.BIN will allow most PSP systems to boot the game if the unit's custom firmware allows the use of 64MB of RAM, which is not available on PSP-1000 units. A couple of days ago Volition revealed Saints Row Undercover, a cancelled PSP title, and now the studio has released the ISO files for free so people can experience what could have been. Unmodified, the prototype is unplayable on a real PSP with modern CFW, as the BOOT.BIN file is used and not the EBOOT.BIN one.

It's rather unfinished though, with buggy physics and only one mission with a voice track. After the game was discovered inside storage, the ISO was released by Volition themselves, except without radio music tracks, due to copyright issues. Originally slated to be a port of Saints Row 2, the game was eventually altered into its own entry, but developmental reasons caused it to be cancelled. Saints Row Undercover, previously titled Saints Row: The Fall and codenamed 'Saints Row 2 PSP', is an unreleased PlayStation Portable entry in the series. Add info about the prototype, its features, and content not used within it.

Download saints row undercover