If you have tried to install an update and it has installed incorrectly, or your device is saying to restore it via iTunes, you may be looking for help to recover data. Follow the prompts to Update the device in iTunes by plugging it into your computer.
Before allowing iTunes to erase an data, check out this program to help recover your data first. The Mac version is here. The Windows version is here. Now I haven't used these programs yet, but it's worth a try.