any downgrader on http://www.psp-hacks.com/category/35 is pretty safe to use
just read the readme.txt
i downgraded a 2.0 yesterday i had a problem with the mph tif
it wont load inside the photo menu
so i had to go to 2.71 to use easy downgrader full on it
and it worked fine its the 3rd psp that i downgraded
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