diff --git a/html/header.html b/html/header.html
index 6dde443..ee61c5a 100644
--- a/html/header.html
+++ b/html/header.html
@@ -12,7 +12,7 @@
         <div style="display: flex; align-items: center; gap: 2rem;">
             <img src="/logo.png" alt="FilaMan Logo" class="logo">
             <div class="logo-text">
-                <h1>FilaMan<span class="version">v1.1.0</span></h1>
+                <h1>FilaMan<span class="version">v1.2.0</span></h1>
                 <h4>Filament Management Tool</h4>
             </div>
         </div>
@@ -21,6 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">
diff --git a/html/index.html b/html/index.html
index 31a8dab..59e4c1c 100644
--- a/html/index.html
+++ b/html/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!-- head --><!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
@@ -12,7 +12,7 @@
         <div style="display: flex; align-items: center; gap: 2rem;">
             <img src="/logo.png" alt="FilaMan Logo" class="logo">
             <div class="logo-text">
-                <h1>FilaMan<span class="version">v1.0.2</span></h1>
+                <h1>FilaMan<span class="version">v1.2.0</span></h1>
                 <h4>Filament Management Tool</h4>
             </div>
         </div>
@@ -21,6 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">
@@ -33,7 +34,7 @@
         </div>
     </div>
 
-
+<!-- head -->
 
     <div class="container">
         <h1>FilaMan</h1>
diff --git a/html/rfid.html b/html/rfid.html
index 051e7e5..a6a2c38 100644
--- a/html/rfid.html
+++ b/html/rfid.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!-- head --><!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
@@ -12,7 +12,7 @@
         <div style="display: flex; align-items: center; gap: 2rem;">
             <img src="/logo.png" alt="FilaMan Logo" class="logo">
             <div class="logo-text">
-                <h1>FilaMan<span class="version">v1.0.2</span></h1>
+                <h1>FilaMan<span class="version">v1.2.0</span></h1>
                 <h4>Filament Management Tool</h4>
             </div>
         </div>
@@ -21,6 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">
@@ -33,6 +34,7 @@
         </div>
     </div>
 
+<!-- head -->
 
 <div class="connection-status hidden">
     <div class="spinner"></div>
diff --git a/html/spoolman.html b/html/spoolman.html
index 46e044c..33d9aff 100644
--- a/html/spoolman.html
+++ b/html/spoolman.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!-- head --><!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
@@ -12,7 +12,7 @@
         <div style="display: flex; align-items: center; gap: 2rem;">
             <img src="/logo.png" alt="FilaMan Logo" class="logo">
             <div class="logo-text">
-                <h1>FilaMan<span class="version">v1.0.2</span></h1>
+                <h1>FilaMan<span class="version">v1.2.0</span></h1>
                 <h4>Filament Management Tool</h4>
             </div>
         </div>
@@ -21,6 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">
@@ -33,6 +34,7 @@
         </div>
     </div>
 
+<!-- head -->
 
     <script>
         window.onload = function() {
diff --git a/html/waage.html b/html/waage.html
index 7587fa7..5806235 100644
--- a/html/waage.html
+++ b/html/waage.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!-- head --><!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
@@ -12,7 +12,7 @@
         <div style="display: flex; align-items: center; gap: 2rem;">
             <img src="/logo.png" alt="FilaMan Logo" class="logo">
             <div class="logo-text">
-                <h1>FilaMan<span class="version">v1.0.2</span></h1>
+                <h1>FilaMan<span class="version">v1.2.0</span></h1>
                 <h4>Filament Management Tool</h4>
             </div>
         </div>
@@ -21,6 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">
@@ -33,6 +34,7 @@
         </div>
     </div>
 
+<!-- head -->
 
     <div class="content">
         <h1>Scale Configuration Page</h1>
diff --git a/html/wifi.html b/html/wifi.html
index 458672c..709a43f 100644
--- a/html/wifi.html
+++ b/html/wifi.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!-- head --><!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
@@ -12,7 +12,7 @@
         <div style="display: flex; align-items: center; gap: 2rem;">
             <img src="/logo.png" alt="FilaMan Logo" class="logo">
             <div class="logo-text">
-                <h1>FilaMan<span class="version">v1.0.2</span></h1>
+                <h1>FilaMan<span class="version">v1.2.0</span></h1>
                 <h4>Filament Management Tool</h4>
             </div>
         </div>
@@ -21,6 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">
@@ -33,6 +34,7 @@
         </div>
     </div>
 
+<!-- head -->
 
     <div class="content">
         <h1>WiFi Configuration Page</h1>
diff --git a/scripts/combine_html.py b/scripts/combine_html.py
index b13ccd6..def4a95 100644
--- a/scripts/combine_html.py
+++ b/scripts/combine_html.py
@@ -1,7 +1,10 @@
 Import("env")
 import os
+import re
 
 def combine_html_files(source, target, env):
+    print("COMBINE HTML FILES")
+    
     html_dir = "./html"
     header_file = os.path.join(html_dir, "header.html")
     
@@ -18,14 +21,14 @@ def combine_html_files(source, target, env):
             with open(file_path, 'r') as f:
                 content = f.read()
             
-            # Replace placeholder with header content
-            if '{{header}}' in content:
-                new_content = content.replace('{{header}}', header_content)
-                
-                # Write back combined content
-                with open(file_path, 'w') as f:
-                    f.write(new_content)
-                print(f"Combined header with {filename}")
+            # Replace content between head comments with header content
+            pattern = r'(<!-- head -->).*?(<!-- head -->)'
+            new_content = re.sub(pattern, r'\1' + header_content + r'\2', content, flags=re.DOTALL)
+            
+            # Write back combined content
+            with open(file_path, 'w') as f:
+                f.write(new_content)
+            print(f"Combined header with {filename}")
 
 # Register the script to run before building SPIFFS
 env.AddPreAction("buildfs", combine_html_files)
\ No newline at end of file
diff --git a/scripts/pre_build.py b/scripts/pre_build.py
index a047d85..351ca4b 100644
--- a/scripts/pre_build.py
+++ b/scripts/pre_build.py
@@ -22,4 +22,4 @@ def replace_version(source, target, env):
     with open(header_file, 'w') as file:
         file.write(content)
 
-env.AddPreAction("buildfs", replace_version)
\ No newline at end of file
+env.AddPreAction("buildfs", replace_version)
diff --git a/src/main.cpp b/src/main.cpp
index 50769d1..d50fb22 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,11 +1,10 @@
 #include <Arduino.h>
-#include <WiFi.h>
-#include <esp_wifi.h>
 #include <DNSServer.h>
-#include <WiFiManager.h>
 #include <ESPmDNS.h>
 #include <Wire.h>
+#include <WiFi.h>
 
+#include "wlan.h"
 #include "config.h"
 #include "website.h"
 #include "api.h"
@@ -16,12 +15,6 @@
 #include "esp_task_wdt.h"
 #include "commonFS.h"
 
-// ***** WIFI initialisieren
-WiFiManager wm;
-bool wm_nonblocking = false;
-void initWiFi();
-// ################### Functions
-
 // ##### SETUP #####
 void setup() {
   Serial.begin(115200);
@@ -97,9 +90,6 @@ void loop() {
 
   unsigned long currentMillis = millis();
 
-  // Falls WifiManager im nicht blockenden Modus ist
-  //if(wm_nonblocking) wm.process();
-
   // Send AMS Data min every Minute
   if (currentMillis - lastAmsSendTime >= amsSendInterval) {
     lastAmsSendTime = currentMillis;
@@ -165,40 +155,3 @@ void loop() {
   yield();
   esp_task_wdt_reset();
 }
-
-// ##### Funktionen für Konfiguration #####
-void initWiFi() {
-  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
-
-  esp_wifi_set_max_tx_power(72); // Setze maximale Sendeleistung auf 20dBm
-
-  if(wm_nonblocking) wm.setConfigPortalBlocking(false);
-  wm.setConfigPortalTimeout(320); // Portal nach 5min schließen
-
-  oledShowTopRow();
-  oledShowMessage("WiFi Setup");
-  
-  bool res;
-  // res = wm.autoConnect(); // auto generated AP name from chipid
-  res = wm.autoConnect("FilaMan"); // anonymous ap
-  // res = wm.autoConnect("spoolman","password"); // password protected ap
-
-  if(!res) {
-    Serial.println("Failed to connect or hit timeout");
-    // ESP.restart();
-    oledShowTopRow();
-    oledShowMessage("WiFi not connected Check Portal");
-  } 
-  else {
-    wifiOn = true;
-
-    //if you get here you have connected to the WiFi    
-    Serial.println("connected...yeey :)");
-    Serial.print("IP address: ");
-    Serial.println(WiFi.localIP());
-
-    oledShowTopRow();
-    display.display();
-  }
-}
-// ##### Funktionen für Konfiguration Ende #####
diff --git a/src/wlan.cpp b/src/wlan.cpp
new file mode 100644
index 0000000..38544e7
--- /dev/null
+++ b/src/wlan.cpp
@@ -0,0 +1,45 @@
+#include <Arduino.h>
+#include "wlan.h"
+#include <WiFi.h>
+#include <esp_wifi.h>
+#include <WiFiManager.h>
+#include "display.h"
+#include "config.h"
+
+WiFiManager wm;
+bool wm_nonblocking = false;
+
+void initWiFi() {
+    WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
+  
+    esp_wifi_set_max_tx_power(72); // Setze maximale Sendeleistung auf 20dBm
+  
+    if(wm_nonblocking) wm.setConfigPortalBlocking(false);
+    wm.setConfigPortalTimeout(320); // Portal nach 5min schließen
+  
+    oledShowTopRow();
+    oledShowMessage("WiFi Setup");
+    
+    bool res;
+    // res = wm.autoConnect(); // auto generated AP name from chipid
+    res = wm.autoConnect("FilaMan"); // anonymous ap
+    // res = wm.autoConnect("spoolman","password"); // password protected ap
+  
+    if(!res) {
+      Serial.println("Failed to connect or hit timeout");
+      // ESP.restart();
+      oledShowTopRow();
+      oledShowMessage("WiFi not connected Check Portal");
+    } 
+    else {
+      wifiOn = true;
+  
+      //if you get here you have connected to the WiFi    
+      Serial.println("connected...yeey :)");
+      Serial.print("IP address: ");
+      Serial.println(WiFi.localIP());
+  
+      oledShowTopRow();
+      display.display();
+    }
+  }
\ No newline at end of file
diff --git a/src/wlan.h b/src/wlan.h
new file mode 100644
index 0000000..2ba117f
--- /dev/null
+++ b/src/wlan.h
@@ -0,0 +1,8 @@
+#ifndef WLAN_H
+#define WLAN_H
+
+#include <Arduino.h>
+
+void initWiFi();
+
+#endif
\ No newline at end of file
