diff --git a/ESP8266/ESP8266.ino b/ESP8266/ESP8266.ino
index b6ff4e0..46b6ecd 100644
--- a/ESP8266/ESP8266.ino
+++ b/ESP8266/ESP8266.ino
@@ -7,7 +7,7 @@
 // ================================================================
 //  OTA CONFIG
 // ================================================================
-#define FW_VERSION   1
+#define FW_VERSION   2
 #define GITEA_HOST   "https://git.nacho.myds.me"
 #define GITEA_OWNER  "Natxo"
 #define GITEA_REPO   "Arduino-Car"
@@ -74,6 +74,16 @@ static void checkOTA() {
     body.trim();
     int remoteVer = body.toInt();
     if (remoteVer > FW_VERSION) {
+      // 4 pitidos = ESP8266 actualizando
+      pinMode(buzzerPin, OUTPUT);
+      for (int i = 0; i < 4; i++) {
+        digitalWrite(buzzerPin, HIGH);
+        delay(150);
+        digitalWrite(buzzerPin, LOW);
+        delay(150);
+      }
+      delay(300);
+
       BearSSL::WiFiClientSecure updateClient;
       updateClient.setInsecure();
       ESPhttpUpdate.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
diff --git a/Esp32Cam/Esp32Cam.ino b/Esp32Cam/Esp32Cam.ino
index 1f4fb44..4c2e1a5 100644
--- a/Esp32Cam/Esp32Cam.ino
+++ b/Esp32Cam/Esp32Cam.ino
@@ -10,7 +10,7 @@
 // ================================================================
 //  OTA CONFIG
 // ================================================================
-#define FW_VERSION   1
+#define FW_VERSION   2
 #define GITEA_HOST   "https://git.nacho.myds.me"
 #define GITEA_OWNER  "Natxo"
 #define GITEA_REPO   "Arduino-Car"
@@ -45,6 +45,15 @@ static void checkOTA() {
   int remoteVer = body.toInt();
   if (remoteVer <= FW_VERSION) return; // ya tenemos la última versión
 
+  // 3 pitidos = ESP32-CAM actualizando (via Serial al ESP8266)
+  for (int i = 0; i < 3; i++) {
+    Serial.print("H1");
+    delay(150);
+    Serial.print("H0");
+    delay(150);
+  }
+  delay(300);
+
   // Hay versión nueva → descargar y flashear
   WiFiClientSecure updateClient;
   updateClient.setInsecure();
diff --git a/firmware/esp32cam/firmware.bin b/firmware/esp32cam/firmware.bin
index a10c850..4da2076 100644
Binary files a/firmware/esp32cam/firmware.bin and b/firmware/esp32cam/firmware.bin differ
diff --git a/firmware/esp32cam/version.txt b/firmware/esp32cam/version.txt
index d00491f..d8263ee 100644
--- a/firmware/esp32cam/version.txt
+++ b/firmware/esp32cam/version.txt
@@ -1 +1 @@
-1
+2
\ No newline at end of file
diff --git a/firmware/esp8266/firmware.bin b/firmware/esp8266/firmware.bin
index 0069815..72910af 100644
Binary files a/firmware/esp8266/firmware.bin and b/firmware/esp8266/firmware.bin differ
diff --git a/firmware/esp8266/version.txt b/firmware/esp8266/version.txt
index d00491f..d8263ee 100644
--- a/firmware/esp8266/version.txt
+++ b/firmware/esp8266/version.txt
@@ -1 +1 @@
-1
+2
\ No newline at end of file