En esta ocasión el juego GripShift (versión USA) tiene un exploit que permite ser usado por el momento sin acceso al kernel, necesario para poder instalar un custom firmware.
Vídeo demostración.
Hello World on PSP FW 1.52-5.02
The Spartaaaaaaaaaaaaaaaaaaaa!!! Exploit
by MaTiAz & FreePlay
Instructions
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1. Copy the contents of MS_ROOT into the root of your memory stick.
(This will overwrite the first GripShift savegame slot).
2. Launch the US version of GripShift.
3. Load up the game (if it doesn't autoload).
4. See your PSP run unsigned code.
It'll autoexit after some time. You can use the home button to exit too if
you've seen enough.
FAQ
---
Q: Will this allow downgrading?
A: No, because this is an usermode exploit and functions required to downgrade are
only available in kernel mode.
Q: Why the name?
A: Because the original exploit was found by overwriting the player name with
"this is spartaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaa".
Q: Can/Will Sony block this?
A: Yes.
Q: I wanna make homebrew using the exploit. How?
A: Get FreePlay's GS SDK: http://tinyurl.com/sparta-sdk
It has some constraints though, check the readme.
The Hello World was written with it.
Credits
-------
Exploit and binary loader: MaTiAz
SDK: FreePlay
Greets go to Dark_AleX, Mathieulh, jas0nuk, Hellcat, etc. etc. etc, you know.
