Espressif provides guidelines and a sample implementation of FOTA (Firmware Over-The-Air) function to upgrade the firmware on devices powered by the ESP8266. ESP8266 device will download a new version of firmware from the update server over Wi-Fi and run it. This guide is intended to help you run a FOTA demonstration on the ESP8266 easily and quickly, with a PC acting as the local update server. The FOTA test has been demonstrated and run on the ESP-Launcher, an ESP8266 evaluation board designed by Espressif.