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I see a lot of people having trouble with getting their codes loading, well here's a couple tips on making them load every time
Tip #1. Make sure neither of your code files are over 1kb. If they're 2kb or anything higher, your codes will not work.
Tip #2. People talk about going to split screen to make sure their codes work, well here's a shorter way. When you go to multiplayer,
before you press play online, press the PS button - go to account management - Press triangle - press X on "Auto Sign-In OFF". Then exit xmb and hit play online, your codes should work. Just always remember to turn auto-sign in back ON because you have to do this every time to ensure your codes to work.
I do not take credit for discovering either of these tips, just trying to help some people out

please THANK and +rep if this helps you out