Hi I have a psp slim with 3.90 M33-2 installed. I need to unbrick my friend's psp slim to 3.90. I dont know how to do it directly. Which guide should I use? Pls help! When I downgraded mine I used pandora gui v1.5 and downgraded to 3.71 M33 from 3.90 OFW. THen I updated to 3.80 and later to 3.90. Just want to know the direct way of doing it.