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 -

D002D51C 023A
8002D51E 1000
============
D002D494 000A
8002D496 1000

try all 4 first, if that doesnt work, try the first 2, if that doesnt work, try the second 2. one of those combo's should work.

lemmie know if you get it to work.