Unverified. To duplicate items after downloading Xbox 360 Shivering Isles expansion pack do the following:

1. Equip a Scroll that you have multiple of (for example, Minor Heal Other x10). If you have ten scrolls you will get ten items.

2. Swing a weapon, and before the animation is over go to your inventory.

3. Select the equipped scroll and press GREEN twice (you won't get a message)

4. Drop the item you want to be duplicated. Note: you can only duplicate things that you have less than the amount of scrolls you equipped. So for example with ten scrolls, you cannot duplicate a potion where you have eleven bottles of. To get around this just drop a few of the items you want to duplicate before you start this glitch so you have fewer items than the amount of scrolls that you have.