diff --git a/synology_dsm_upgrade_api.yml b/synology_dsm_upgrade_api.yml
index d130141..5e9ad21 100644
--- a/synology_dsm_upgrade_api.yml
+++ b/synology_dsm_upgrade_api.yml
@@ -14,13 +14,20 @@
 
     refuse_if_no_upgrade_api: true
 
-    # méthodes candidates (DSM varie)
+    # Méthodes candidates (DSM varie selon versions)
     upgrade_status_methods:
       - "status"
       - "get"
       - "check"
+
+    # Méthode "start" pour déclencher l'upgrade
     upgrade_start_method: "start"
 
+    # Attente reboot (sec)
+    reboot_wait_timeout: 1800   # 30 min
+    reboot_down_timeout: 300    # 5 min
+    reboot_up_timeout: 1800     # 30 min
+
   tasks:
     - name: Construire base_url
       ansible.builtin.set_fact:
@@ -118,15 +125,6 @@
               | first) | default({})
           }}
 
-    - name: Afficher les réponses status (debug)
-      ansible.builtin.debug:
-        var: upgrade_status_attempts.results
-
-    - name: Afficher statut retenu (debug)
-      ansible.builtin.debug:
-        var: upgrade_status.json
-      when: upgrade_status | length > 0
-
     - name: Fail si aucune méthode status n'a fonctionné
       ansible.builtin.fail:
         msg: >-
@@ -134,17 +132,25 @@
           Vérifie les méthodes supportées (status/get/check) sur ce DSM.
       when: upgrade_status | length == 0
 
-    # ---- START : seulement si "ready" (on ne devine pas : on log l’état) ----
-    - name: Déterminer si une mise à jour semble prête (heuristique)
+    - name: Debug - statut retenu
+      ansible.builtin.debug:
+        var: upgrade_status.json
+
+    # ---- READY CHECK (inclut ton cas "ready_upgrade") ----
+    - name: Déterminer si une mise à jour est prête
       ansible.builtin.set_fact:
         upgrade_ready: >-
           {{
             (
               (upgrade_status.json.data is defined)
               and (
-                (upgrade_status.json.data.ready is defined and upgrade_status.json.data.ready | bool)
-                or (upgrade_status.json.data.need_update is defined and upgrade_status.json.data.need_update | bool == false)
-                or (upgrade_status.json.data.status is defined and (upgrade_status.json.data.status|string) in ['ready','downloaded','prepared'])
+                (upgrade_status.json.data.allow_upgrade is defined and upgrade_status.json.data.allow_upgrade | bool)
+                and (
+                  (upgrade_status.json.data.status is defined and (upgrade_status.json.data.status|string) in
+                    ['ready','downloaded','prepared','ready_upgrade']
+                  )
+                  or (upgrade_status.json.data.ready is defined and upgrade_status.json.data.ready | bool)
+                )
               )
             ) | default(false)
           }}
@@ -152,7 +158,7 @@
     - name: Stop si pas prête (évite code 103) + message clair
       ansible.builtin.fail:
         msg: >-
-          DSM refuse le start (souvent code 103) car la mise à jour n’est pas "prête".
+          DSM n'est pas prêt à lancer l'upgrade via API (souvent code 103 si on force).
           Vérifie sur DSM: Panneau de config > Mise à jour DSM :
           - téléchargement terminé
           - EULA/consentement accepté
@@ -160,27 +166,54 @@
           Statut API (data): {{ upgrade_status.json.data | default({}) | to_nice_json }}
       when: not upgrade_ready
 
-    - name: Start DSM upgrade (SYNO.Core.Upgrade)
+    # ---- START (POST form-urlencoded, plus fiable) ----
+    - name: Start DSM upgrade (SYNO.Core.Upgrade start)
       ansible.builtin.uri:
-        url: "{{ base_url }}/webapi/{{ upgrade_path }}?api=SYNO.Core.Upgrade&version={{ upgrade_ver }}&method={{ upgrade_start_method }}&_sid={{ sid }}"
-        method: GET
+        url: "{{ base_url }}/webapi/{{ upgrade_path }}"
+        method: POST
         validate_certs: "{{ syno_verify_ssl }}"
         return_content: true
         status_code: 200
         timeout: "{{ uri_timeout }}"
+        body_format: form-urlencoded
+        body:
+          api: SYNO.Core.Upgrade
+          version: "{{ upgrade_ver }}"
+          method: "{{ upgrade_start_method }}"
+          _sid: "{{ sid }}"
       register: upgrade_start
 
-    - name: Fail si start a échoué
+    - name: Fail si start a échoué (message lisible)
       ansible.builtin.fail:
         msg: >-
           Echec du démarrage upgrade DSM via API.
-          Réponse: {{ upgrade_start.json | to_nice_json }}
-      when: upgrade_start.json.success != true
+          Réponse: {{ upgrade_start.json | default(upgrade_start.content) }}
+      when: upgrade_start.json is not defined or upgrade_start.json.success is not defined or upgrade_start.json.success != true
 
     - name: Afficher résultat start
       ansible.builtin.debug:
         var: upgrade_start.json
 
+    # ---- WAIT REBOOT (si DSM indique reboot:true, on attend la chute + le retour) ----
+    - name: Attendre que DSM tombe (reboot en cours)
+      ansible.builtin.wait_for:
+        host: "{{ inventory_hostname }}"
+        port: "{{ syno_port }}"
+        state: stopped
+        timeout: "{{ reboot_down_timeout }}"
+      delegate_to: localhost
+      when: upgrade_status.json.data.reboot is defined and upgrade_status.json.data.reboot | bool
+
+    - name: Attendre le retour de DSM (port 5001)
+      ansible.builtin.wait_for:
+        host: "{{ inventory_hostname }}"
+        port: "{{ syno_port }}"
+        state: started
+        delay: 10
+        timeout: "{{ reboot_up_timeout }}"
+      delegate_to: localhost
+      when: upgrade_status.json.data.reboot is defined and upgrade_status.json.data.reboot | bool
+
     - name: Logout DSM API
       ansible.builtin.uri:
         url: "{{ base_url }}/webapi/{{ auth_path }}?api=SYNO.API.Auth&version=2&method=logout&session={{ syno_session | urlencode }}&_sid={{ sid }}"
@@ -190,4 +223,4 @@
         status_code: 200
         timeout: "{{ uri_timeout }}"
       register: logout
-      failed_when: false
\ No newline at end of file
+      failed_when: false