Don’t know how to turn on your USB debugging mode on your LG G3 ? Just play the video guide to access the “Developer Options” menu and enable USB Debugging Mode on LG G3 right now:
LG G3 Data Manager:
Old Phone (include iCloud,iTunes,Blackberry,Samsung Kies backup) to LG G3 Data Transfer:
[Video] Sync Music from iTunes to LG G3:
After your LG G3 USB debugging mode is enabled, you can do the data recovery or data transfer freely & easily.