As of 11/1/2012- The Official Android 4.0.4 was released for the LG Viper 4G LTE. I am trying too get too get it posted at this time with the download link.
Please read this webpage.
Sprint Community: LG Viper 4G LTE: LG Viper 4G LTE Software Updates
Directions how too install the update.zip manually.
1. download this link
Download update.zip from Sendspace.com - send big files the easy way
the filename is update.zip (don't change it or will not be able too install correctly later on in this guide)
2. transfer the file you just downloaded too the root of sd card.
3. make sure you have adb install on pc and turn on usb debug on your device.
4. if you don't have adb install. here is a download link just for you
Download ADB.zip from Sendspace.com - send big files the easy way
5. when that file is downloaded open it using windows explorer and it will show a folder called adb. copy that folder too the C drive of your pc.
6. now lets run cmd command in windows 7. click on your windows 7 icon on the bottom leftside of your screen.
there is a place called search files and programs. in that spot please type in cmd.
7. now you will get your c:\user\whateverishere> type cd\ and press enter
8. now you should a display that shows c:\
9. next type this command in c:\adb when you have done that press enter
10. now your command prompt is C:\ADB>
11. now type in this command on the C:\ADB> adb reboot recovery and press enter
12. now the phone will reboot in stock recovery and when it does select update.zip in your menu choice in the recovery menu and the process takes about 10 mins too install when it dones your device will reboot too ICS
P.S. your home button is the select button when you chose your update.zip. many members brought it too my attention and glad they did. I forgot too add it too the directions. thanks everyone for correcting me on that note.
Please don't change the filename when you download the update.zip. just download the file and move it too the sd card