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[HELP] Owners of Hilton Garden Inn: Ultimate Team Play

 Originally posted on Reddit r/PSP

Hello everyone,

In an effort to preserve the PSP, we are looking for owners of the Hilton Garden Inn: Ultimate Team Play game with the original PSP that has the official game update installed.

As part of the game update process that runs at the game's start up, an update is normally installed to the MemoryStick. To be more specific, the game update file is called GAME.PRX, and is located in the PSP/GAME/UCUS94341 folder of the MemoryStick. This was done by an Hilton employee/manager the first time the game was booted.

However, as part of the installation process via the PSP install utility API, the update file (GAME.PRX) is basically encrypted with a private key that is unique to each PSP out there. We want to retreive and preserve the plain-decrypted version of this GAME.PRX file. The only way to do so, is to run a PSP application tool I made for this exact purpose. The tool(1) has to be run with the PSP to which the update was installed to, since the file is exclusively encrypted for this PSP device.

The tool simply opens the encrypted GAME.PRX file, copy its contents into the PSP RAM, decrypts the contents, and writes the plain decrypted data into a new file (hence, preserving the integrity of the original GAME.PRX file installed to this PSP). The process is 100% safe(2).

Do you possess one of the rare PSP with the Hilton Garden game update installed, and want to help the PSP community ? Run the tool, and get the plain-decrypted game update file for the community. From there, as I've already reverse-engineered the PSP game update install process, I may be able to recreate the orignal game update install file (EBOOT.PBP) which everyone can then use to install the update to their PSP, especially official PSP firmware (OFW) users. Rest assured, we will guide you through this fairly easy process.

Thank you!

NOTE: even if you don't have the game nor the update, you can help us by up-voting this post and sharing it to others. This will increase this post visibility on reddit, and therefore our chances. We really appreciate, thank you.

EDIT: To be clear, when your PSP has the official game update installed, the game boot process should be exactly like in this video (@JCarlin42). As you can see, the game first launches a popup saying "Ultimate Team Play PSP game data has already been installed", then the updated game module (GAME.PRX) from the MemoryStick gets loaded, and the game proceeds to run it, finally appears the game logo. If your game boot process is exactly as described, we need you.

(1) The tool works with both official and custom firmwares.
(2) Successfully used a similar tool for Killzone: Liberation and SOCOM: FireTeam Bravo 2 updates.