Ok, so the other day I went to upgrade my psp to version 3.52
M33. At first it was working fine, iso and whatnot. But after
downloading Gpsp (gba emulator) and placing it in the Game150
folder, my isos all couldn't work. When trying to start up the isos
the screen just freezes and stays black. I didn't have this problem
before. 
The ironic thing is that only the gpsp could work but not the isos.
The problem still persists even after i deleted off my gpsp.
Anybody can give me some advice? 