Put the gba roms and bios in game 150 folder. i dont know if zip files your work but you need a custom firmware psphacks people use your heads. Put the gba bios and the gba roms in the game150 folder in the psp folder for version 3.40 oe-a and 3.3 oe-a and in the game folder in the psp for version 1.5. If you formatted the memory stick when you first hacked your psp you should already have the game150 folder.

i meant 2.4 at the end and 2.3 sorry about that.