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Showing content from https://github.com/esp8266/Arduino/issues/1782 below:

Reboot Stuck after ESPhttpUpdate · Issue #1782 · esp8266/Arduino · GitHub

Hardware: ESP-12 (ESP8266 Feather HUZZAH)
Core Version: 2.1.0-rc2

After the .bin file is downloaded from the server, the ESP8266 reboots but gets stuck and doesn't run the new program until a physical reset happens (a button in this case on the ESP8266 Feather).

Module: ESP-12
Flash Size: 4MB
CPU Frequency: 80Mhz
Upload Using: SERIAL

/**
 * httpUpdate.ino
 *
 *  Created on: 27.11.2015
 *
 */

#include <Arduino.h>

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <ESP8266HTTPClient.h>
#include <ESP8266httpUpdate.h>

#define USE_SERIAL Serial

ESP8266WiFiMulti WiFiMulti;

void setup() {

    USE_SERIAL.begin(115200);
    // USE_SERIAL.setDebugOutput(true);

    USE_SERIAL.println();
    USE_SERIAL.println();
    USE_SERIAL.println();

    for(uint8_t t = 4; t > 0; t--) {
        USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
        USE_SERIAL.flush();
        delay(1000);
    }

    WiFiMulti.addAP("SSID", "PASSWORD");

}

void loop() {
    // wait for WiFi connection
    if((WiFiMulti.run() == WL_CONNECTED)) {

        t_httpUpdate_return ret = ESPhttpUpdate.update("http://server/file.bin");
        //t_httpUpdate_return  ret = ESPhttpUpdate.update("https://server/file.bin");

        switch(ret) {
            case HTTP_UPDATE_FAILED:
                USE_SERIAL.printf("HTTP_UPDATE_FAILD Error (%d): %s", ESPhttpUpdate.getLastError(), ESPhttpUpdate.getLastErrorString().c_str());
                break;

            case HTTP_UPDATE_NO_UPDATES:
                USE_SERIAL.println("HTTP_UPDATE_NO_UPDATES");
                break;

            case HTTP_UPDATE_OK:
                USE_SERIAL.println("HTTP_UPDATE_OK");
                break;
        }
    }
}

[SETUP] WAIT 3...
[SETUP] WAIT 2...
[SETUP] WAIT 1...

 ets Jan  8 2013,rst cause:2, boot mode:(1,7)


 ets Jan  8 2013,rst cause:4, boot mode:(1,7)

wdt reset

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