When you buy new ESP8266 chip its comes with AT firmware. But afterwards we may use some other firmware(NodeMCU, Arudino, ESPressif, Mangoose). Then again want do AT firmware to ESP8266? we do no how to flash AT firmware again to ESP8266. Its very easy and simple. Same like flash the AT firmware to ESP8266 if you have a doubt see below this tutorial will help you.

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