
Originally Posted by
Smarter People than I
2.81 - 3.03 homebrew
On 25 January 2007, a user-mode exploit was discovered, affecting all PSP firmwares from 2.00 to 3.03. A "Hello World" application, called the Goofy Exploit, was subsequently released by the Noobz team, proving that unsigned code could be run on a 2.81+ PSP. The exploit requires an un-patched copy of Grand Theft Auto: Liberty City Stories (it is a variation of the old LCS exploit, exploiting the fact that sony's patch only affected the save slots 0 - 7 however auto load also loads save games in slot 8 and 9, allowing the same exploit to be used if it's stored in either of these 2 slots).
On 28 January 2007,The Noobz team released the 3.03 HEN and downgrader. It wasn't until after however that a beta version was leaked earlier on the web. It is highly encouraged to stay away from this "sure-brick" and only use the files listed on team Noobz's official website.
Also released alongside the downgrader was a release of HEN (Homebrew Enabler) for 3.03 users who did not wish to downgrade but wanted the benefits of homebrew on a 3.03 system. This also requires the use of an unpatched Grand Theft Auto: Liberty City Stories UMD.