i risked it, and it was worth it. i downgraded my psp and it worked perfectly and i even got a program to trick the psp into thinking it is a 2.0 so i can still play all the new games, i havent heared of any psp's getting bricked by using this yet. so go ahead and use it :)
ohh and btw,
http://www.sonyxteam.com/
is the best place to download this, they released a new version as well, 1.0 :)[/url]