If you don't have a strong Wi-Fi or Verizon Wireless network connection, you may not be able to perform an Over The Air (OTA) update. Instead, you can connect your device to a computer with internet access using your USB cable. Then download the Software Upgrade Assistant tool onto your computer, which will check for updates and initiate the update process. If you aren't able to power on your device, download the tool directly to your computer:
Please follow the step-by-step instructions to install the Software Upgrade Assistant tool.