In order to update the Sprint LG Optimus G to the latest Android 4.1.2 Jelly Bean ZVB, you have to first flash/return your device back to stock. The file attached below is the official stock ICS zv9 I got from official LG site, and this file is already converted from tot to bin
Official Sprint LG Optimus G ICS ZV9 Firmware / ROM Download:
For now in my option the easiest way to flash the Sprint LG Optimus G is using the LGNPST tool. You can download here:
I’ll post the instructions on how to flash/return/root/unlock Sprint LG Optimus G for the guys who are new to the device.
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Thanks for posting the info… where are the instructions on how to revert back to stock using these methods