ps2 patching

can anybody tell me how to sucessfully patch a ps2 backup. my jap ps2 is chipped so i want to play backups on it. i tried to copy all star wrestling. but i doesn't boot. can anybody tell me waht programs i'll need and where to get. also are there any sites that trade patched ps2 backups. i could also do with some pal patches so i can play some pal games on my jap ps2, if thats possible.

thanx in advance to anybody who helps
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in the mean time keep burning