diff --git a/cores/esp8266/Updater.cpp b/cores/esp8266/Updater.cpp
index edd72766b..c4ec4b00b 100644
--- a/cores/esp8266/Updater.cpp
+++ b/cores/esp8266/Updater.cpp
@@ -1,6 +1,8 @@
 #include "Updater.h"
 #include "Arduino.h"
 #include "eboot_command.h"
+#include "interrupts.h"
+
 //#define DEBUG_UPDATER Serial
 
 extern "C" {
diff --git a/cores/esp8266/Updater.h b/cores/esp8266/Updater.h
index eac84f466..c8b4e81f1 100644
--- a/cores/esp8266/Updater.h
+++ b/cores/esp8266/Updater.h
@@ -11,6 +11,8 @@
 #define UPDATE_ERROR_SIZE   4
 #define UPDATE_ERROR_STREAM 5
 
+//#define DEBUG_UPDATER Serial1
+
 class UpdaterClass {
   public:
     UpdaterClass();
diff --git a/cores/esp8266/debug.h b/cores/esp8266/debug.h
index 7bdc247bd..fe389bb2d 100644
--- a/cores/esp8266/debug.h
+++ b/cores/esp8266/debug.h
@@ -2,8 +2,11 @@
 #define ARD_DEBUG_H
 
 #include <stddef.h>
-// #define DEBUGV(...) ets_printf(__VA_ARGS__)
+//#define DEBUGV(...) ets_printf(__VA_ARGS__)
+
+#ifndef DEBUGV
 #define DEBUGV(...)
+#endif
 
 #ifdef __cplusplus
 void hexdump(uint8_t *mem, uint32_t len, uint8_t cols = 16);
diff --git a/libraries/ESP8266WiFi/src/WiFiClient.cpp b/libraries/ESP8266WiFi/src/WiFiClient.cpp
index 4c1aa192e..8165ba3ba 100644
--- a/libraries/ESP8266WiFi/src/WiFiClient.cpp
+++ b/libraries/ESP8266WiFi/src/WiFiClient.cpp
@@ -332,3 +332,16 @@ void WiFiClient::stopAll()
         }
     }
 }
+
+
+void WiFiClient::stopAllExcept(WiFiClient * exC) {
+    for (WiFiClient* it = _s_first; it; it = it->_next) {
+        ClientContext* c = it->_client;
+
+        if (c && c != exC->_client) {
+            c->abort();
+            c->unref();
+            it->_client = 0;
+        }
+    }
+}
diff --git a/libraries/ESP8266WiFi/src/WiFiClient.h b/libraries/ESP8266WiFi/src/WiFiClient.h
index 241b80f09..77ba1a698 100644
--- a/libraries/ESP8266WiFi/src/WiFiClient.h
+++ b/libraries/ESP8266WiFi/src/WiFiClient.h
@@ -96,6 +96,7 @@ public:
   using Print::write;
 
   static void stopAll();
+  static void stopAllExcept(WiFiClient * c);
 
 private:
 
diff --git a/libraries/ESP8266WiFi/src/WiFiUdp.cpp b/libraries/ESP8266WiFi/src/WiFiUdp.cpp
index 733ba3ff8..50734d1dd 100644
--- a/libraries/ESP8266WiFi/src/WiFiUdp.cpp
+++ b/libraries/ESP8266WiFi/src/WiFiUdp.cpp
@@ -290,3 +290,12 @@ void WiFiUDP::stopAll()
         it->stop();
     }
 }
+
+void WiFiUDP::stopAllExcept(WiFiUDP * exC) {
+    for (WiFiUDP* it = _s_first; it; it = it->_next) {
+        if (it->_ctx != exC->_ctx) {
+            DEBUGV("%s %08x %08x\n", __func__, (uint32_t) it, (uint32_t) _s_first);
+            it->stop();
+        }
+    }
+}
diff --git a/libraries/ESP8266WiFi/src/WiFiUdp.h b/libraries/ESP8266WiFi/src/WiFiUdp.h
index 16aa0a3be..011de2e64 100644
--- a/libraries/ESP8266WiFi/src/WiFiUdp.h
+++ b/libraries/ESP8266WiFi/src/WiFiUdp.h
@@ -105,6 +105,7 @@ public:
   uint16_t localPort();
 
   static void stopAll();
+  static void stopAllExcept(WiFiUDP * exC);
 
 };
 
diff --git a/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp b/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp
index 8c42afffc..e4e062ff0 100644
--- a/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp
+++ b/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp
@@ -128,10 +128,17 @@ t_httpUpdate_return ESP8266HTTPUpdate::update(const char * host, uint16_t port,
                     ret = HTTP_UPDATE_FAILD;
                     DEBUG_HTTP_UPDATE("[httpUpdate] FreeSketchSpace to low (%d) needed: %d\n", ESP.getFreeSketchSpace(), len);
                 } else {
-                    if(ESP.updateSketch(tcp, len)) {
-                        // may never reached!
+
+                    WiFiUDP::stopAll();
+                    WiFiClient::stopAllExcept(&tcp);
+
+                    delay(100);
+
+                    if(ESP.updateSketch(tcp, len, false, false)) {
                         ret = HTTP_UPDATE_OK;
                         DEBUG_HTTP_UPDATE("[httpUpdate] Update ok\n");
+                        tcp.stop();
+                        ESP.restart();
                     } else {
                         ret = HTTP_UPDATE_FAILD;
                         DEBUG_HTTP_UPDATE("[httpUpdate] Update failed\n");
diff --git a/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h b/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h
index 911a6a565..a167f9fe4 100644
--- a/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h
+++ b/libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h
@@ -28,6 +28,8 @@
 
 #include <Arduino.h>
 #include <ESP8266WiFi.h>
+#include <WiFiUdp.h>
+#include <WiFiClient.h>
 
 //#define DEBUG_HTTP_UPDATE(...) Serial1.printf( __VA_ARGS__ )
 
diff --git a/tools/sdk/include/osapi.h b/tools/sdk/include/osapi.h
index 404efb855..1169e5406 100644
--- a/tools/sdk/include/osapi.h
+++ b/tools/sdk/include/osapi.h
@@ -46,7 +46,7 @@
 
 #ifdef USE_OPTIMIZE_PRINTF
 #define os_printf(fmt, ...) do {	\
-	static const char flash_str[] ICACHE_RODATA_ATTR = fmt;	\
+	static const char flash_str[] ICACHE_RODATA_ATTR __attribute__((aligned(4))) = fmt;	\
 	os_printf_plus(flash_str, ##__VA_ARGS__);	\
 	} while(0)
 #else