If your iPod is not detected by iTunes when you connect it to your computer, you may need to put it into DFU mode before you can restore it.
Data synced with iTunes will not be backed up and will need to be re-synced later.
When choosing your restore method, choose the option that gives you access to the backup that you want to restore.
Click on your iPod to open the Summary tab of the main iTunes window. If your device is not recognized and the display shows a sad face, try putting the iPod into Disk Mode before restoring. If you cannot enter Disk Mode, then there is a hardware issue.
Mac users will be asked for the administrator password. If using Windows, you may see one or more restore options prompting iTunes to automatically download the latest iPod Software. Holding down the SHIFT key before clicking the Restore button will allow you to browse your computer for version of firmware you wish to use.
Disconnect iPod and connect it to iPod Power Adapter (for older iPod models). Leave iPod connected to computer to complete restore (applies to new iPod models).
The progress bar may be difficult to see because the backlight on the iPod display may be turned off.
