Update your iPhone 5S, 5C, 5, 4S and iPad to iOS 8 may due to data loss, then backup data before upgrade iOS 8 is very important. What if without backup and data missing, you can watch the video guides in this channel to restore lost data on iOS 8 update.<br /><br />More info, please refer to http://www.any-data-recovery.com/product/iphone-data-recovery.html