Firmware refers to the software that controls the basic functions of a device, including the operating system, device drivers, and utility programs. In the case of the LG E400 Optimus L3, the firmware is based on Android 2.3 (Gingerbread) and includes LG's custom user interface and apps.
Release the buttons once the yellow screen appears. Step 3: Configure the Flash Tool LG Optimus L3 E400 | Specifications and User Reviews Firmware LG E400 Optimus L3