Unless you are running 1.50 (on a psp slim you wont be) it's not possible, however making a magic memory card is easy, just back up your data and put some files on the card and a pandora battery is cheap. I personally used this one http://www.dealextreme.com/details.dx/sku.12472 but this other one may be a better investment http://www.dealextreme.com/details.dx/sku.15153
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Really a pandora battery can be made (official battery + mod = expensive) or purchased (about 20 bucks including a magic memory card) online including shipping. It's the most effective reliable way to do it - but not sure if it works on psp3k.
No way sorry I've searched for years I hope I'm wrong tough