However you got your game on the HD, if you used an original disc to get your game on there, then i help you. Put eboot fix for game unrared onto USB HD drive (plugged into PC), thumb drive (on PC) or FTP. I dont want to go into how to set up FTP as thats out of the scope currently of what yr trying to do. After putting unrared fixed game files on USB drive, unplug from PC and plug into PS3 open a file manager Comegenie or Multiman (select+start). Browse to the fixed files you just put on USB drive on left, browse to your game on right. Most fixes are applied in USRDIR folder in the game (like eboot.bin).
PS3 Slim 4.21.2 Rebug REX 4.31 Spoof (external 1TB/3TB), PS2 Fat w/ Internal HD