Download Firmware Lg Nexus 5 X. You'll get a bunch of files required to run the program. Next menu will open with your LG phone details.
The firmware file is used to provide update or flash the mobile phones. To do- See below, If it fails for first time repeat it. Download and install LG USB drivers then, Download LG Flash tool.
Video review of the model and its features.
Stock firmware fix software related issues, IMEI related issues, improve performance and boot loop issues, etc.
This is very easy to do and is useful for it your are trying to sell the phone. Next menu will open with your LG phone details. Power button; Select Turn off the phone. press the volume up button on your LG; During you are holding the volume up key, plug in your phone's USB Data cable.