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Is there any way to check if ESP-8266 boards are not defective. I am using USB TTL serial adapter. It has five pins. 5V, RX, TX, GND, 3.3V.

I've connected in following way
RX<->TX, TX<->RX, GPIO0<->3.3V, GPIO15 <-> GND

I don't see any response in minicom, I've also tried coolterm. I've tried 9600, 11500 baud rates. There is no way to set 76800 in both software.