Why won't my folder show up on my PSP in USB mode?

rehack your psp by using cfw 1.5, then go to 4.01 m33-6, then 5.00 m33-6, then gen a, gen b(1), gen b(2), gen c, gen d, gen d full, and finally 6.20 gen. ( although it is the long way, it is safer than jumping from cfw to another kind of cfw.) if you want the cfw's email me at edwardyeh777@hotmail.com