diff --git a/arduino/KmanSonoff_v1.00mc/KmanSonoff_v1.00mc.ino b/arduino/KmanSonoff_v1.00mc/KmanSonoff_v1.00mc.ino
index da91d96..1b39644 100755
--- a/arduino/KmanSonoff_v1.00mc/KmanSonoff_v1.00mc.ino
+++ b/arduino/KmanSonoff_v1.00mc/KmanSonoff_v1.00mc.ino
@@ -187,6 +187,9 @@ void setup() {
   WiFi.hostname(UID);
   WiFi.begin(WIFI_SSID, WIFI_PASS);
   ArduinoOTA.setHostname(UID);
+  #ifdef OTA_PASS
+    ArduinoOTA.setPassword(OTA_PASS);
+  #endif
   ArduinoOTA.onStart([]() {
     OTAupdate = true;
     blinkLED(LED, 400, 2);
diff --git a/arduino/KmanSonoff_v1.00mc/config_mc.h b/arduino/KmanSonoff_v1.00mc/config_mc.h
index a1b5a03..833aa50 100755
--- a/arduino/KmanSonoff_v1.00mc/config_mc.h
+++ b/arduino/KmanSonoff_v1.00mc/config_mc.h
@@ -27,6 +27,7 @@ int QOS = 0;                                                  // QOS level for a
 
 #define WIFI_SSID        "wifissid"                           // Your WiFi ssid
 #define WIFI_PASS        "wifipass"                           // Your WiFi password
+#define OTA_PASS         0				                            // OTA Password for reflashing - if 0 disabled
 /*
   ======================================================================================================================================
 */
diff --git a/arduino/KmanSonoff_v1.00sc/KmanSonoff_v1.00sc.ino b/arduino/KmanSonoff_v1.00sc/KmanSonoff_v1.00sc.ino
index ed9afbc..ed502f3 100755
--- a/arduino/KmanSonoff_v1.00sc/KmanSonoff_v1.00sc.ino
+++ b/arduino/KmanSonoff_v1.00sc/KmanSonoff_v1.00sc.ino
@@ -119,6 +119,9 @@ void setup() {
   WiFi.hostname(UID);
   WiFi.begin(WIFI_SSID, WIFI_PASS);
   ArduinoOTA.setHostname(UID);
+  #ifdef OTA_PASS
+    ArduinoOTA.setPassword(OTA_PASS);
+  #endif
   ArduinoOTA.onStart([]() {
     OTAupdate = true;
     blinkLED(LED, 400, 2);
diff --git a/arduino/KmanSonoff_v1.00sc/config_sc.h b/arduino/KmanSonoff_v1.00sc/config_sc.h
index 557ec11..d619bd4 100755
--- a/arduino/KmanSonoff_v1.00sc/config_sc.h
+++ b/arduino/KmanSonoff_v1.00sc/config_sc.h
@@ -30,6 +30,7 @@ int QOS = 0;                                                  // QOS level for a
 
 #define WIFI_SSID        "wifissid"                           // Your WiFi ssid
 #define WIFI_PASS        "wifipass"                           // Your WiFi password
+#define OTA_PASS         0				                            // OTA Password for reflashing - if 0 disabled
 /*
   ===========================================================================================================================================
 */