espcomm_sync failed
Posted: Fri Feb 17, 2017 7:00 pmI have been programming ESP8266-01s using the Arduino IDE and a programming adapter board that has a button for grounding GPIO0. I programmed them with a blink sketch and it worked and then I added a Serial.print command and that worked too but now it won't program. I tried holding reset until just before programming, and changing the programming speed to 9600. Can someone help me ?