DCEmu Forums poster kgsws is reporting that a new exploit of the PSP can be found via the game Medal of Honor Heroes. According to him, it's only been tested on the M33 Phat and the CFW 3000.
The info Readme details the instructions as well as some further tips and tricks in running this exploit. So far, however, it has yet to be seen if this ma work with non-CFW PSP at all. You're free to try though if you can. Just follow the source link below.
Other Hacks and Exploits for the PSP:
- Custom Firmware 5.50GEN-B now available
- WIP:Yoshihiro's 5.50 debug firmware for PSP Fat
- Custom Firmware 5.50 U3R released, version 2 now available