FOTA 'Firmware' means. Firmware Over this feature without connection with a compatible USB data cable-The-Air (FOTA) is used to update a new version of the software on your phone. If this feature, install a new firmware version available for your LG device.

Through FOTA update How?

Sign the Settings menu.
General Menu
Enter below the pop-up screen with the About Phone section.
Open the Update Center.
Enter the Software Update Section.
Updates section click the Check Now.
Existing software will be checked automatically. If a software is available, the software update screen, select the 'Download' option. Select screen 'download now'. The update will automatically begin to descend. After installation is complete, the phone will automatically restart.