To update the software
  1. Make sure your device is fully charged and connected to Wi-Fi.
  2. From the device home screen, pull down the notification shade and tap Settings > General.
  3. Tap About phone > Update Center > Software update > Update Now.
  4. Follow the on-screen prompts to download and install the update.
  5. The device automatically restarts once the new software successfully installs.

To verify the update
  1. From the device home screen, pull down the notification shade and tap Settings > General > About phone > Software info.
  2. The device has the latest software if the Software version matches the current update details. 

To troubleshoot the software update