yoshihiro made a program to swap the region settings for the button pad to make jap psp buttons like us psp (x and o)
Yoshihiro is proud to bring you today the -= PAD region Swapper -=
What it does: It swaps O and X buttons for the JAP PSP 1.5 (only JAP&1.5!) So your JAP psp become like US.(only for buttons)
HoW ?:Just follow instructions on your screen and don't forget to plug you AC adapter.
How to reverse?: Easy you just have to go to system setting ==> Restore default Setting.
get it here