Along with sound problem, all my contact details have also gone missing after uploading the new version. Any suggestion please for the revival. - B.D.Wadhwa
As far as your contacts did you have them saves to iCloud? If so, store from there and that will put them back on your iPad. As to no sound, make sure the volume is up. After updating my fathers iPad, the volume was muted which caused it o have no sound. Simple fix. Good luck