Modded console tutorial. It's essential that the PS3 firmware match the title, otherwise find a newer video by this guy. Be careful and follow the video closely. Alternatively instead of multiMAN like he gets, you could get webMan (which I think is what most Sly people have done)
If your PS3 system software is newer than 4.92 and the old tutorial does not work for you, check out the channel of MrMario for updated tutorials.