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Open your serial monitor and send “AT” command, this should return “OK”. To test that the firmware is successfully installed. This needs only to be connected to ground while firmware upgrade. Disconnect GPO01 pin of ESP8266 from the ground pin from the FDTI or Arduino.Error message will show at the end - ignore it.This will start installing the firmware to your esp8266 Change the COM to the COM that the device is using.Click Bin and locate the firmware file and click open.
To enable firmware upgrade it is requirement to connect GPIO0 to ground (0 Volts) ("pulled low") to enable firmware update mode (as shown in wiring diagram above).Connect the wires according to figure 1 if using FTDI board or figure 2 if using Arduino to upgrade firmware.In order to update the firmware you need to configure the hardware to enter firmware update mode: Load bare minimal script if using Arduino. Load the following bare minimal script, just to make sure that Arduino does not have any pre-existing scripts loaded, which may interfere with upgrade process. Note: If using Arduino to upgrade the firmware. Wiring for Firmware Upgrade using Arduino Wiring for Firmware Upgrade using FTDI board (3.3V) Only do this if you want to update to a custom version. The supplied module already has the latest firmware, So there is no need to update it.