• esptool v1.2.1
• Arduino IDE 1.6.13

• http://arduino.esp8266.com/staging/package_esp8266com_index.json als Board hinzufügen
• In der Datei ~/.arduino15/packages/esp8266/hardware/esp8266/2.3.0-rc2/platform.txt folgende Änderung vornehmen

#tools.esptool.upload.pattern="{path}/{cmd}" {upload.verbose} -cd {upload.resetmethod} -cb {upload.speed} -cp "{serial.port}" -ca 0x00000 -cf "{build.path}/{build.project_name}.bin"
tools.esptool.upload.pattern="/usr/local/bin/esptool.py" --port "{serial.port}" --baud {upload.speed} write_flash 0x00000 "{build.path}/{build.project_name}.bin"

• Folgende Einstellungen in der Arduino IDE setzen:
  • Flash Mode: QIO
  • Flash Frequency: 40 MHz
  • CPU Frequency: 80 MHz
  • Flash Size: 2M
  • Reset mode: ck
  • Uploadspeed: 115200
• Test sketch:

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Test your ESP8266");
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Tick");
  delay(500);
  Serial.println("Tack");
  delay(500);
}

• Widerstand auf GND ziehen
• Sketch flashen
• Widerstand entfernen
• ESP Powercyceln