1.Go to Dashboard and to system Then Storage

2.Hover Over you Hard Drive then press Y

3.Press Clear System Cache Then Yes

4.Load up MineCaft if you did it right it should ask for update press No

5.Load you save and connect you controller

6.Go to Player one and give player 2 PicAxe

7.put dispenser down and put what you want to duplicate in dispenser

8.Get Player 2 too delete it

9 do what you normally do to duplicate

10. when done that save then disconnect player to then sign in to xbox live then when you try load your save it will say lost connection to sever so you make new save then leave he new save and load your old save then your done.