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Play 1 public match. If you are getting an error message, do a fresh start.

no you must reset your account before works 100%

Use a fresh start (reset all stats)

Step 1: Do the Glitch and use a Fresh Start.
Step 2: Exit Black Ops 2 to the XMB menu
Step 3: Start Black Ops 2 and do the glitch again.
Step 4: Play one public match.
Step 5: Enjoy your duped stats.