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Let me know how your are powering the esp8266 first and the other connections too.This is the first hurdle when you use the esp8266. Next is the firmware file is itself corrupt.you need to download the AT firmware file from github.com. Also check the esp8266 temperature regularly.If the temperature is exceeded due to excess of voltage the esp can get internally damage.There are fake esp8266 01 modules available in market be careful.
Let me know how your are powering the esp8266 first and the other connections too
By default it comes with AT firmware.There is no need to flash new firmware.
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