Download Verizon LG G3 USB Drivers:
Download Verizon Wireless Software Upgrade Assistant
VZW Upgrade Assistant tool for Windows
VZW Upgrade Assistant tool for Mac
The VerizonSWUpgradeAssistantLauncher.exe (204K) is included in above zip file, Run it to install Software Upgrade Assistant Tool
Download Backup Assistant Plus for LG G3 VS985
Go http://www.verizonwireless.com/wcms/overlays/bua-plus-overlay.html to download the Software.
Compatible with Windows XP, Vista, Windows 7 (32 and 64 bit) and Windows 8 (32 and 64 bit) versions, Mac (OSX 10.5 or greater) and Linux (32 and 64 bit Ubuntu, Kubuntu 10.04 and 11.04)
Wish this help! You are welcome to join in LG G3 community on Google Plus to discuss about LG G3 Software features, Tips & tricks and etc.