It depends on which model your iPod is. For sixth- and fifth-generation iPods, iPod nano, iPod mini and fourth-generation iPods- 1.) (optional) Connect the iPod to a power outlet using the AC power adapter. 2.) Push the Hold switch to lock and back to unlock. 3.) Press and hold the Menu and Select (center) buttons simultaneously for at least six seconds until the Apple logo appears; then release. When you do this, you will not lose any of your content or settings.