[wraggster] was first to send in the latest news on PSP hacking. Yesterday a firmware downgrader was released to take PSPs running v2.71 down to the homebrew friendly v1.5 firmware. The authors took advantage of a tiff expolit to get it working and apparently bricked four PSPs in the process. Looks like it’s working, but there are plenty of caveats to read up on before giving it a shot.