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I've just bought NodeMCU LoLin ESP8266, I tried to send AT commands (after spending days on ESP8266-01) and everything was okay. Than I've uploaded the Blink example to the board, after that moment it's not responding to any command.

I tried to update firmware, it's updating successfully but nothing has changed. By the way blink app is not working also...

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    the Blink program replaced the AT program – Juraj Apr 5 '18 at 17:42
  • @Juraj How can I put it back? – Sahin Apr 5 '18 at 17:54
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    download the AT firmware binary from Espressif site. On Windows you can use Espressif Flash Download Tool to flash it. On Linux use esptool.py. espressif.com/en/support/download/… – Juraj Apr 5 '18 at 18:10
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    Done, thanks! Can you add this as an answer, people who has the same problem may see it easier :) – Sahin Apr 5 '18 at 18:26
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If you replaced AT firmware in esp8266 with Blink and you want it back, download the AT firmware from Espressif download page and flash it with the Espressif Flash Download Tool (Windows) or with esptool.py.

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