You can download the update via Firmware Over the Air (FOTA).
You must connect your device to Wi-Fi to download the update.
Although there should be no impacts to settings or data, we recommend that you back up your media files to an SD card, a PC or using a favorite application (from the Play Store), prior to upgrading the software.
Update & verify software
To update the software
Make sure your device is sufficiently charged and connected to Wi-Fi.
From the device home screen, tap Applications > Settings > About phone > Software update > Check for updates.
Follow the on-screen prompts to download and install the update.
The device automatically restarts once the new software successfully installs.
To verify the update
From the device home screen, tap Applications > Settings > About phone.
The device has the latest software if the Baseband version and Build number match the current update details.