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  • You could try the hardware serial? Or pull the reset pin low and then talk to the ESP directly through USB. Might check if those work. Commented May 13, 2016 at 11:52
  • @Paul: the nano has only one set of hardware serial ports. So if I use those I cannot send data to the Arduino Serial Monitor anymore, making it hard to understand what is happening... Guess I'll need to go for firmware upgrade. Commented May 13, 2016 at 12:50
  • well you could make use of the software serialport for debugging? You'll need a "usb-serial/ttl" cable though. Commented May 13, 2016 at 12:58
  • 1
    stackoverflow.com/questions/34248581/… This will answer your question. Commented Feb 26, 2017 at 7:52
  • 1
    Seems that setting the baud rate with AT+IPR=9600 also bricks an ESP01. I tried several suggestions in this thread to recover it. The solution in the link Marco Andre Silva supplied worked for me. Commented May 13, 2017 at 13:56