ok i have the 2.71 and downgraded to 1.5 then got oe-a and then oe-b i really dont know what that means but i did it and it worked..all the iso's i got worked when installed in the iso folder, but my son broke the psp and im having to start over again not remimbering what i did the first time...i read all the post and tells me how to get to oe-a, i remimber that part so do i need to go to oe-b? and how dow i get there? OR whats the difference in "upgrading" do use devhook? what would be the most user friendly way of going about this? and i have downgraded before so im not worried about that... i mostly play iso,emulatoer snes,nes, and would like to play movie files and mp3, i might dabble in the homebrew scene for neat option for my psp....any help would be greatly apprciated p.s. i know how to downgrade and upgrade i found the post by reading alot of threads and doing alot of searches just couldnt find anything about the oe-b thing?