As usual, This update is pushed to your phone over-the-air. If you haven’t received the update notification yet, you can manually check for the update by going to Settings > About Phone > System Updates.
If your phone displays Your system is currently up to date, your phone is on the most current software version, or the update hasn’t been pushed to your phone yet.
How to Check the Software version on your LG Viper smart phone.
1. From the Home screen, press Menu and tap Settings
2. Flick down to scroll up and tap About phone
3. Flick down to scroll up and the software version is displayed under SW Version
If Your device’s current software version is “LS840ZVD”, that means your device are ready to receive this “LS840ZVI” update OTA (over the Air). The first update for LG Viper is “LS840ZVC” released on 4/22/2012, if you missed the previous update, you need to download LG Mobile Support Tools to update your device software to version “LS840ZVD”.