Dl the file below:

http://www.megaupload.com/?d=XYX54EC0
copy all files and paste them to first page, open seplugins folder and find the game note and paste this "ms0:/seplugins/peagasus.prx 1" in the game note.
if you don't have game note on your seplugins folder, make one by using notepad and paste ms0:/seplugins/peagasus.prx 1 and save it on seplugins and remove usb from psp. now, let's start patching the game.
first, start iso patch on psp and select "patch prometheus" choose "ME631"
hope it works for everyone. thanks