In this projct, we will show how to burn the MQTT firmware for the ESP13 WiFi shield. To complete the next operation, we need to do the following preparations：
Before install firmware, you need download following software first:
Unzip above files into c:\flash_download_tools_v3.6.3 folder.
Overhere, we use the CP1202 USB to TTL adapter. There are two kinds of voltage modes，you can use this addpter to connect the ESP WiFi Shield to computer as follows:
Use the 3.3 V voltage
Use the 5 V voltage
After completed above operations, open C:\FLASH_DOWNLOAD_TOOLS_V3.6.3 folder and run ESPFlashDownloadTool_v3.6.3.exe program file, now you can config the software settings as per following steps:
Choose the "ESP8266 DownloadTool" for this project.
Set the field values as per following instruction:
As the below photo, you can see "FINISH" on the software, it means you have burned the MQTT firmware successfully.
When we have burned the firmware, if the ESP WiFi Shield restarts again and again, or the softAP can't be built up, please click the "ERASE" button to erase the flash, then repeat the above steps.
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