diff --git a/picopy/wifi.py b/picopy/wifi.py
index 5b062a4..2d2812b 100644
--- a/picopy/wifi.py
+++ b/picopy/wifi.py
@@ -5,7 +5,7 @@ import threading
 import time
 
 from picopy.config import (
-    NM_AP_CON, NM_CLIENT_CON, WIFI_BOOT_WAIT,
+    NM_AP_CON, NM_CLIENT_CON,
     load_cfg, log
 )
 
@@ -81,6 +81,17 @@ def stop_ap():
     nm('con', 'down', NM_AP_CON)
 
 
+def _takeover_wifi_autoconnect():
+    """Deaktiviert Autoconnect aller Fremd-WLAN-Profile, damit NM beim Boot PiCopy-WiFi bevorzugt."""
+    r = nm('-t', '-f', 'NAME,TYPE', 'con', 'show')
+    for line in r.stdout.splitlines():
+        parts = line.split(':', 1)
+        if len(parts) == 2 and parts[1] == '802-11-wireless' and parts[0] not in (NM_CLIENT_CON, NM_AP_CON):
+            nm('con', 'mod', parts[0], 'connection.autoconnect', 'no')
+            log.info(f'Autoconnect für Fremdprofil deaktiviert: {parts[0]}')
+    nm('con', 'mod', NM_CLIENT_CON, 'connection.autoconnect', 'yes')
+
+
 def connect_client_wifi(ssid, password):
     log.info(f'Verbinde mit WiFi: {ssid}')
     nm('con', 'delete', NM_CLIENT_CON)
@@ -98,6 +109,7 @@ def connect_client_wifi(ssid, password):
     ok = r.returncode == 0
     if ok:
         log.info(f'Verbunden mit {ssid}')
+        _takeover_wifi_autoconnect()
     else:
         log.error(f'WiFi-Verbindung fehlgeschlagen: {r.stderr.strip()}')
     return ok
@@ -139,19 +151,49 @@ def update_wifi_state():
             wifi_state.update(mode='disconnected', ssid='', ip='')
 
 
+def _wait_for_nm(max_wait: int = 30) -> None:
+    """Wartet bis NetworkManager bereit ist, statt eine feste Zeit zu schlafen."""
+    for i in range(max_wait):
+        r = nm('general', 'status')
+        if r.returncode == 0:
+            if i > 0:
+                log.info(f'NetworkManager bereit nach {i}s')
+            return
+        time.sleep(1)
+    log.warning('NetworkManager nach 30s noch nicht bereit')
+
+
 def wifi_monitor():
-    log.info(f'WiFi-Monitor: warte {WIFI_BOOT_WAIT}s auf Verbindung...')
-    time.sleep(WIFI_BOOT_WAIT)
+    log.info('WiFi-Monitor: warte auf NetworkManager...')
+    _wait_for_nm()
+
+    first_run = True
 
     while True:
         try:
             update_wifi_state()
             with wifi_lock:
                 mode = wifi_state['mode']
+                current_conn = wifi_state.get('ssid', '')
+
+            cfg = load_cfg()
+            picopy_ssid = cfg.get('wifi_ssid', '')
+
+            # Beim ersten Durchlauf: falls ein Fremdprofil (Imager) verbunden ist
+            # und PiCopy eine eigene SSID kennt → zu PiCopy-WiFi wechseln
+            if first_run and mode == 'client' and current_conn != NM_CLIENT_CON and picopy_ssid:
+                log.info(f'Fremdprofil aktiv ({current_conn}), wechsle zu PiCopy-WiFi ({picopy_ssid})...')
+                connected = connect_client_wifi(picopy_ssid, cfg.get('wifi_password', ''))
+                if connected:
+                    time.sleep(5)
+                    update_wifi_state()
+                    with wifi_lock:
+                        mode = wifi_state['mode']
+
+            first_run = False
 
             if mode == 'disconnected':
-                cfg = load_cfg()
-                ssid = cfg.get('wifi_ssid', '')
+                ssid = picopy_ssid
                 pw   = cfg.get('wifi_password', '')
 
                 connected = False
@@ -163,7 +205,7 @@ def wifi_monitor():
 
                 if not connected:
                     ap_ssid = cfg.get('ap_ssid', 'PiCopy')
-                    ap_pw   = cfg.get('ap_password', 'PiCopy,')
+                    ap_pw   = cfg.get('ap_password', 'PiCopy123')
                     if start_ap(ap_ssid, ap_pw):
                         time.sleep(3)
                         with wifi_lock: