a mod chip for the psp
finally homebrew for all versions
"Undiluted Platinum: World's first PSP Modchip!
Here's a picture of U.P. (Undiluted Platinum), a flash replacement system for the PSP which allows the use of previous flash updates or custom flash builds. Installation has been optimized to fit entirely inside PSP, this opens up the possibility to run unsigned Homebrew code on the latest PSP systems. More info will be available next week"