Update issue for iPad Air 2.

Hi, I tried to update my iPad Air 2 to iOS 9.2.1 but my iPad froze during the restore process and i can't stop/undo the process. The restore process would stopped about 3/4 of the way through (at the firmware stage) and "Error 56" pop up. Now I can't use the iPad anymore because its stuck at the Apple logo or the iTunes screen. The guy at the Apple Store said it was a hardware issue but the iPad (1 year and 2 month old) was working perfectly fine without any problems before this. If anyone else experienced this and was able to fix it, I would greatly appreciate your advice on how to fix this or reverse the process. Thank you.