I recently bought an iPad2 in the USA and brought it back to the UK. However, it says that it is unable to play DVDs. I used iTunes to access a European-code DVD and it plays OK on an iPod touch. However, when opened using "video" on the iPad, it starts to open but a pop-up states that the iPad is unable to play the video. I suspect that this is due to the iPad2 being set up for the USA region. How do I reset it for the European region?