diff --git a/src/ota.cpp b/src/ota.cpp
index bcb6bf4..ea48e85 100644
--- a/src/ota.cpp
+++ b/src/ota.cpp
@@ -8,15 +8,29 @@
 const uint8_t FIRMWARE_MAGIC = 0xE9;
 const uint8_t ESP_MAGIC = 0xE9;
 
+void stopTasks() {
+    // Stop all tasks
+    vTaskSuspend(NULL);
+}
+
 void handleOTAUpload(AsyncWebServerRequest *request, String filename, size_t index, uint8_t *data, size_t len, bool final) {
     static size_t contentLength = 0;
     static bool isFullImage = false;
     static uint32_t currentOffset = 0;
     static uint8_t *spiffsBuffer = nullptr;
     static size_t spiffsSize = 0;
-    static const uint32_t SPIFFS_START = 0x310000;  // Standard SPIFFS start address in full.bin
+    static const uint32_t SPIFFS_START = 0x310000;  // SPIFFS start in full.bin
     
+    stopTasks();
+    vTaskDelay(100 / portTICK_PERIOD_MS);
+
     if (!index) {
+        // Reset static variables
+        if (spiffsBuffer) {
+            free(spiffsBuffer);
+            spiffsBuffer = nullptr;
+        }
+        
         contentLength = request->contentLength();
         Serial.printf("Update size: %u bytes\n", contentLength);
         
@@ -25,12 +39,11 @@ void handleOTAUpload(AsyncWebServerRequest *request, String filename, size_t ind
             return;
         }
 
-        // Prüfe Magic Byte für Image-Typ
         if (data[0] == ESP_MAGIC) {
-            // Normales Firmware Image oder full.bin
             isFullImage = (contentLength > 0x3D0000);
             
-            if (!Update.begin(contentLength)) {
+            // Korrektur: Bei full.bin die gesamte Größe verwenden
+            if (!Update.begin(contentLength, U_FLASH)) {
                 Serial.printf("Not enough space: %u required\n", contentLength);
                 request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"Not enough space available\"}");
                 return;
@@ -39,14 +52,14 @@ void handleOTAUpload(AsyncWebServerRequest *request, String filename, size_t ind
             Serial.println(isFullImage ? "Full image update started" : "Firmware update started");
             
             if (isFullImage) {
-                // Allocate buffer for SPIFFS data if it's a full image
-                spiffsSize = 0x0F0000;  // Standard SPIFFS size
+                spiffsSize = 0x0F0000;  // 960KB SPIFFS size
                 spiffsBuffer = (uint8_t*)malloc(spiffsSize);
                 if (!spiffsBuffer) {
                     Serial.println("Failed to allocate SPIFFS buffer");
                     request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"Memory allocation failed\"}");
                     return;
                 }
+                memset(spiffsBuffer, 0xFF, spiffsSize); // Initialize buffer with 0xFF
             }
         } else {
             request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"Invalid image format\"}");
@@ -55,26 +68,36 @@ void handleOTAUpload(AsyncWebServerRequest *request, String filename, size_t ind
         currentOffset = 0;
     }
     
-    // Handle SPIFFS data collection for full image
-    if (isFullImage && spiffsBuffer) {
-        uint32_t spiffsOffset = currentOffset - SPIFFS_START;
-        if (currentOffset >= SPIFFS_START && spiffsOffset < spiffsSize) {
-            size_t copyLen = min(len, spiffsSize - spiffsOffset);
-            if (spiffsOffset + len > spiffsSize) {
-                copyLen = spiffsSize - spiffsOffset;
+    if (isFullImage) {
+        // Zuerst vollständiges Firmware-Update durchführen
+        if (Update.write(data, len) != len) {
+            String errorMsg = Update.errorString();
+            if (errorMsg != "No Error") {
+                Update.printError(Serial);
+                if (spiffsBuffer) free(spiffsBuffer);
+                request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"Error writing firmware: " + errorMsg + "\"}");
+                return;
             }
-            memcpy(spiffsBuffer + spiffsOffset, data, copyLen);
         }
-    }
-    
-    // Schreibe Daten
-    if (Update.write(data, len) != len) {
-        String errorMsg = Update.errorString();
-        if (errorMsg != "No Error") {
-            Update.printError(Serial);
-            if (spiffsBuffer) free(spiffsBuffer);
-            request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"Error writing update: " + errorMsg + "\"}");
-            return;
+        
+        // SPIFFS-Daten separat sammeln
+        if (currentOffset >= SPIFFS_START) {
+            uint32_t spiffsOffset = currentOffset - SPIFFS_START;
+            if (spiffsOffset < spiffsSize) {
+                size_t copyLen = min(len, spiffsSize - spiffsOffset);
+                memcpy(spiffsBuffer + spiffsOffset, data, copyLen);
+                Serial.printf("Collecting SPIFFS data at offset %u, length %u\n", spiffsOffset, copyLen);
+            }
+        }
+    } else {
+        // Normal firmware update
+        if (Update.write(data, len) != len) {
+            String errorMsg = Update.errorString();
+            if (errorMsg != "No Error") {
+                Update.printError(Serial);
+                request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"Error writing update: " + errorMsg + "\"}");
+                return;
+            }
         }
     }
     
@@ -86,34 +109,57 @@ void handleOTAUpload(AsyncWebServerRequest *request, String filename, size_t ind
             
             if (isFullImage && spiffsBuffer) {
                 Serial.println("Starting SPIFFS update");
-                if (!SPIFFS.begin(true)) {
-                    Serial.println("SPIFFS mount failed");
+                
+                // Unmount SPIFFS first
+                if (SPIFFS.begin()) {
+                    SPIFFS.end();
                 }
                 
                 // Update SPIFFS
-                if (Update.begin(spiffsSize, U_SPIFFS)) {
-                    if (Update.write(spiffsBuffer, spiffsSize) != spiffsSize) {
-                        Serial.println("SPIFFS Write Failed");
-                        free(spiffsBuffer);
-                        request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"SPIFFS update failed\"}");
-                        return;
-                    }
-                    if (!Update.end(true)) {
-                        Serial.println("SPIFFS End Failed");
-                        free(spiffsBuffer);
-                        request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"SPIFFS finish failed\"}");
-                        return;
-                    }
+                if (!Update.begin(spiffsSize, U_SPIFFS)) {
+                    Serial.println("Could not begin SPIFFS update");
+                    free(spiffsBuffer);
+                    request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"SPIFFS update initialization failed\"}");
+                    return;
                 }
+                
+                if (Update.write(spiffsBuffer, spiffsSize) != spiffsSize) {
+                    Serial.println("SPIFFS Write Failed");
+                    Update.printError(Serial);
+                    free(spiffsBuffer);
+                    request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"SPIFFS write failed\"}");
+                    return;
+                }
+                
+                if (!Update.end(true)) {
+                    Serial.println("SPIFFS End Failed");
+                    Update.printError(Serial);
+                    free(spiffsBuffer);
+                    request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"SPIFFS finish failed\"}");
+                    return;
+                }
+                
                 free(spiffsBuffer);
+                spiffsBuffer = nullptr;
                 Serial.println("SPIFFS update complete");
+                
+                // Verify SPIFFS
+                if (!SPIFFS.begin(true)) {
+                    Serial.println("SPIFFS mount after update failed");
+                    request->send(400, "application/json", "{\"status\":\"error\",\"message\":\"SPIFFS verification failed\"}");
+                    return;
+                }
+                SPIFFS.end();
             }
             
             request->send(200, "application/json", "{\"status\":\"success\",\"message\":\"Update successful! Device will restart...\",\"restart\":true}");
             delay(1000);
             ESP.restart();
         } else {
-            if (spiffsBuffer) free(spiffsBuffer);
+            if (spiffsBuffer) {
+                free(spiffsBuffer);
+                spiffsBuffer = nullptr;
+            }
             String errorMsg = Update.errorString();
             if (errorMsg != "No Error") {
                 Update.printError(Serial);