The first working homebrew on all firmware.. including firmware 3.50. Based on Lumines, the "Illuminati" exploit is a user-mode exploit using a buffer overflow in the savedata file - similar to the GTA exploit.
So if you've got a copy of Lumines (the UMD disc), then you can run homebrew on your PSP, no matter what the firmware version is. Currently, the only homebrew compatible with 3.50 is this Hello World demo, but in the future a new HEN and downgrader will be available!
To make the exploit work:
* Check that you have an EU or US version of Lumines (ULES00043 or ULUS10002). Currently we don't have a version for the Japanese version, but we're working on it, as soon as we get hold of a Japanese UMD.
* Extract the contents of the 'MS_ROOT' folder from the RAR file into the top-level of your memory stick. (HINT: If you wind up with an 'MS_ROOT' folder on the stick, you've done it wrong).
* Start the game, and as soon as it gets to the 'Press START' screen, press START. If you wait until the demo has started, the exploit may not work.
* The screen should go blank, and the exploit will start after a few moments. It doesn't do anything except look pretty at this stage - but feel free to enjoy the first homebrew on your v3.10 - v3.50 PSP!