[Update] The latest firmware for LG VS840 is VS840ZV9.
This is the LG official “VS840ZV7” Android 4.0 ICS Firmware update for LG VS840.
You can download the “vs840zv7” firmware from below link. Please note that it comes with a .cab extension, You will need a .kdz converter to convert the firmware to .kdz file and then use the lg firmware flash tools to update your device.
You can download this VS840ZV9 update and using LG Update tools to update your LG VS840.