make a copy, no patches or modifications.. get the gameshark cd from megagames.com =>psx utilities =>action replay tools => gameshark cd, download it, burn it to a cd. use these codes -

D007AF6C 023A
8007AF6E 1000
D0078464 0008
80078466 2400
===========
D007AEE4 000A
8007AEE6 1000
D0078464 0008
80078466 2400

try all 8 first, if that doesnt work, try the first 4, if that doesnt work, try the second 4. one of those combo's should work.

lemmie know if you get it to work.