To quote from PSGroove: He has managed to run Castlevania: Lords of Shadow from his internal hard drive, while on Geohot's 3.55 Custom Firmware. He achieved this by patching the game's main executable file (EBOOT.BIN) and making the PS3 think it's a PSN game.
Originally Posted by riku.kh3
Castlevania: Lords of Shadow (BLES01047) signed & packed EBOOT (33.5MB)
1) Install PKG file.
2) Transfer contents of USRDIR folder, EXCEPT EBOOT.BIN, to /devhdd0/game/BLES01047/USRDIR/