you need to mount your PSP as super user, open up the terminal and give me the results of
Code:
ls /dev | grep "sd"
you need to post the version with the psp plugged in and the one without
once you've done that you'll need to run these three commands (inserting the difference between the outputs where i put an X)
Code:
sudo umount /dev/X
sudo mkdir /media/psp
sudo mount /dev/X /media/psp