When I first updated my iPod touch 4th generation, I found it great! Back then my iMessage was working fine. About 2 weeks later, iMessage asked me to type in apple ID to activate iMessage. So I typed everything in correctly then processed to the next page. The page said that people would need your email Address to contact you with iMessage. About 3 seconds later it flipped back to the first page! So I signed in again and pressed next in the next page. It was vertifying my email. Then it went back to the first page again. Please help :) much appreciated!