Lite-on drives need special hardware to get the key off of the drive. Specifically you either need a special probe (for v7 lite-ons) or you need to do some soldering and trace cutting (MRA hack). Hopefully whoever flashed your drive before gave you a copy of a .bin file with your drive key in it. If you already have your drive key then you don't need to follow the preliminary steps needed to read your key off of your drive. If you didn't receive anything from the person who flashed your drive, then according to the JungleFlasher tutorial you're going to need to do an MRA hack to get the key off of your drive.