Is your psp version 3.40 OE? (Just making sure). If so, place the eboot of the game and the keys.bin in one a folder and place that folder in the Game Folder on your PSP (Not GAME150 folder). If thats what you are already doing and it isnt working then i suggest remaking the eboot of the game.
Also, if you got the PSX image/iso/etc from a CD, trying getting the info off the CD with another program (My apologies forum mods for talking about game images ; ; ) some programs wont get the image off the CD correctly.
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