If you have gta theres an auto dongrader for psp which you basicaly dont have to do anything perfect if you dont wanna do anyworkill find you a link.
Edit: here it is the blue writing is what you need to read theres links for everything you need here.
http://www.psp-hacks.com/forums/about17935.html
BTW when this downgrader works io recommend you upgrade to 2.0 then back to 1.5 to take out the errors of the 2.6 -1.5 downgrader you can do this by using the mph 2.00 downgrader on the same page in the link i gave you.
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