iOS 9 public version has been recently released, it is more convenient and has plenty of new functions due to this very reason many Apple users would want to upgrade retrieve iPhone data free their device to iOS 9. Users can easily install iOS 9 on their device by using iTunes or by wirelessly. If in case while performing iOS 9 upgrade if the upgrade fails then you would lose all your data. The data can be contacts, texts, videos, music files, attachments, documents, snapped photos, mails, etc. You might be thinking that how can you recover the data that is lost? Will all the lost data be retrieved? The answer is Yes. Moreover, it is important to have backups of your iPhone, iOS and iPad devices.
Lost Data on iPhone, iPad after iOS 9 upgrade failing

When your devices are upgraded to iOS 9 and if it fails during the process then there are chances that you may lose all your data. free iphone data recovery As many users are facing the problem of losing the data after iPhone upgrade fails. There is no need to worry as the data can be retrieved in the following three ways:
Method 1: Recover Lost Data from iCloud Backup After iOS 9 Update

While restoring your iPhone or iPad from iCloud backup you have to use the Setup Assistance to restore iDevice from iTunes backup. And for this you should have a secure Wi-Fi connection or else there are chances that it might take longer time to complete the whole process or it might fail to restore.

Step 1. You have to go to Settings > General > Erase All Content and Settings from your iOS device.

Step 2. After erasing all the content and settings from your device, then go to Setup Assistant mode iPhone data recovery software with a Hello screen.

Step 3. To start the setup process on your device swipe on the screen and then join a stable Wi-Fi network

Step 4. Select Restore from iCloud Backup > Sign into iCloud from your own Apple ID.

Step 5. You can select the iCloud backup that you want to restore, and then wait till all the selected contents in the backup to be returned to your iDevice. It might take some time to backup, as it depends on the speed of the network the size of the iCloud backup.