This little thing will attenpt to downgrade your PSP, let me know if it works. ;)
It takes flash files and dumps them into the ram, then it tricks the PSP into sighned the files for you. Then it exacutes the Flash files in the ram and copys it into the flash. Enjoy :)
It gets the access to dump the files into your ram becuse the flash file is in your ram.
It best used on a frineds PSP, but rember to recored it.