i recommend you to use macrofire plugin
with this plugin you can remap the button in the psp
for exampla you can remap the d-pad button to analog button
it was the umd faulty where it will read ur umd data even u not put the umd in it
i thing ur should switch off the umd switch
since i got the same problem
here the link picture of umd switch button
http://www.llamma.com/PSP/repair/UmdGear.jpg...