Okay I've been modding with a USB for a couple months now and I tried to do the Left 4 Dead 2 Load and pop for some quick gamerscore, but it doesn't seem to work. No one else had a problem with it so I know it's just me. Do I need a JTAG or something ? I dunno. If someone has any tips lemme know. I tried looking for the answers in the forums but couldn't find anything.