Updated mine, but somebody said when they downgraded it went back down. But basebands are not downgrade able so i dont know if that is true. It changes the value of the BB for sure though.
I didn't know this method worked on the iPad/iPod touch since the trick is to get to the "Emergency Call" screen.
2. Triple click the home button and Emergency Call will appear.
3. Click on Emergency Call and, while it's switching, swipe with your three fingers down.