Upgrading from a previous iOS version on iPhone should go smoothly and you should get back the iPhone contents and settings. However, just like you lost iPhone files after iOS 7.1 update, even a well-engineered iOS 8 or iOS 8.1 update can fail and delete your important items.
If your iPhone files are missing after the new iOS 8 installation, try the 3 best options to recover your lost iPhone photos, messages, contacts, notes and other data after updating to iOS 8.
You can freely pick out one of the 3 ways below to get back your iPhone files deleted after iOS 8 or iOS 8.1 upgrade:
All you need to do is just download and install iPhone Data Recovery on your Windows computer (Windows 8.1/8/7/XP/Vista). Mac users go to iPhone Data Recovery for Mac which is based on Mac OS X 10.10/10.9/10.8/10.7. The software supports data recovery on all iPhone models, including iPhone 5S, iPhone 5C, iPhone 5, and iPhone 4S. If you are a user of iPhone 6 or iPhone 6 Plus, the customized iPhone 6 Data recovery will be your better choice to recover lost iPhone data after iOS 8.1 update. Then within a few minutes, all lost data will be recovered.
If you have no iPhone backup files, you can undelete any files like camera roll, SMS, MMS, iMessages, WhatsApp messages, the regular text messages, contacts, notes, call history, etc. without iTunes or iCloud backup.
Connect iPhone to your computer and run iPhone Data Recovery. "Recover Data from iOS Device" is the default mode. Click on "Start Scan" and you can view all iPhone files, including the lost ones and the existing ones. Then you can select them to recover.
You can also retrieve all missing iPhone contents from iTunes backup. Select "Recover Data from iTunes Backup File" on iPhone Data Recovery, select your iPhone backup file to scan and then recover data onto your computer.
If you have iCloud backup file, you can also recover iPhone files from iCloud backup. Switch to "Recover Data from iCloud Backup File" on iPhone Data Recovery, sign into iCloud and you can start to get iCloud backup file for iPhone data recovery after updating to iOS 8.
iPhone Data Recovery is always your best choice to get back iPhone data lost after iOS update. All files can be saved onto your computer, and you can transfer the recovered files from PC back to your iPhone.