help with gba for firmware 2.01

ok i have tryed this heaps with all the files undeleted.., deleting the un needed files (like doom workin on firmware 2.01) delete the 1.5 file and the src file for doom but its like a whole new setup for the gba emu i can actually launch the emu (like how i could on doom b4 i deleted the files) but when i select the roms it f**ks up and it freezes and the psp turns off (like when i select the wads for doom.. before i deleted the files)

so if ya can help me that ll b great