diff --git a/test.yml b/test.yml
index f07165d..25208ec 100644
--- a/test.yml
+++ b/test.yml
@@ -1,23 +1,268 @@
 ---
-- hosts: synology
+- name: Synology DSM - Découverte outils MAJ + tentative download/install (SSH)
+  hosts: synology
   gather_facts: false
+
+  vars:
+    do_install: false   # true => tente de lancer l'installation après download
+    do_reboot: false    # true => reboot après install
+    command_timeout: 120
+
   tasks:
-    - name: Inspect shell env on Synology
-      ansible.builtin.raw: |
-        echo "WHOAMI=$(whoami 2>/dev/null || true)"
-        echo "SHELL0=$0"
-        echo "PATH=$PATH"
-        echo "which_sh=$(command -v sh 2>/dev/null || true)"
-        echo "ls_/bin/sh=$(ls -l /bin/sh 2>/dev/null || true)"
-        echo "ls_/bin/busybox=$(ls -l /bin/busybox 2>/dev/null || true)"
-        echo "which_busybox=$(command -v busybox 2>/dev/null || true)"
-        echo "test_builtin=$(test 1 -eq 1 && echo OK || echo KO)"
-        echo "bracket_cmd=$(command -v '[' 2>/dev/null || true)"
-      register: shinfo
+    - name: Lire version DSM (best effort)
+      ansible.builtin.shell: |
+        if test -f /etc.defaults/VERSION; then
+          cat /etc.defaults/VERSION
+        elif test -f /etc/VERSION; then
+          cat /etc/VERSION
+        else
+          echo "VERSION_FILE_NOT_FOUND"
+        fi
+      args:
+        executable: /bin/bash
+      register: dsm_version
       changed_when: false
 
-    - debug:
-        var: shinfo.stdout_lines
+    - name: Afficher version DSM
+      ansible.builtin.debug:
+        var: dsm_version.stdout_lines
 
-    - debug:
-        var: shinfo.stderr_lines
+    # ------------------------------------------------------------
+    # 1) Découvrir l'outil de MAJ existant
+    # ------------------------------------------------------------
+    - name: Chercher des binaires connus (synoupgrade/synoautoupdate/...)
+      ansible.builtin.shell: |
+        set +e
+
+        candidates="
+        synoupgrade
+        synoautoupdate
+        synoautoupdate2
+        synoupgrade2
+        "
+
+        echo "== command -v =="
+        for c in $candidates; do
+          p="$(command -v "$c" 2>/dev/null)"
+          if [ -n "$p" ]; then
+            echo "$c=$p"
+          fi
+        done
+
+        echo "== common paths =="
+        for p in \
+          /usr/syno/sbin/synoupgrade \
+          /usr/syno/sbin/synoautoupdate \
+          /usr/syno/bin/synoautoupdate \
+          /usr/sbin/synoautoupdate \
+          /usr/syno/sbin/synoupgrade2 \
+          /usr/syno/sbin/synoautoupdate2
+        do
+          if [ -x "$p" ]; then
+            echo "FOUND=$p"
+          fi
+        done
+
+        echo "== find (limited) =="
+        # petit find limité pour éviter de tourner 3h
+        for root in /usr/syno /usr/sbin /usr/bin /bin /sbin; do
+          if [ -d "$root" ]; then
+            find "$root" -maxdepth 3 -type f \( -name "syno*update*" -o -name "syno*upgrade*" \) 2>/dev/null | head -n 50
+          fi
+        done
+
+        exit 0
+      args:
+        executable: /bin/bash
+      register: discover
+      changed_when: false
+
+    - name: Afficher découverte
+      ansible.builtin.debug:
+        var: discover.stdout_lines
+
+    - name: Choisir un binaire (priorité: synoupgrade puis synoautoupdate)
+      ansible.builtin.shell: |
+        set +e
+
+        pick=""
+        if command -v synoupgrade >/dev/null 2>&1; then
+          pick="$(command -v synoupgrade)"
+        elif [ -x /usr/syno/sbin/synoupgrade ]; then
+          pick="/usr/syno/sbin/synoupgrade"
+        elif command -v synoautoupdate >/dev/null 2>&1; then
+          pick="$(command -v synoautoupdate)"
+        elif [ -x /usr/syno/sbin/synoautoupdate ]; then
+          pick="/usr/syno/sbin/synoautoupdate"
+        fi
+
+        if [ -z "$pick" ]; then
+          echo "MISSING"
+        else
+          echo "$pick"
+        fi
+        exit 0
+      args:
+        executable: /bin/bash
+      register: picked
+      changed_when: false
+
+    - name: Enregistrer outil de MAJ
+      ansible.builtin.set_fact:
+        upgrade_tool: "{{ picked.stdout | trim }}"
+
+    - name: Stop si aucun outil trouvé (message clair)
+      ansible.builtin.fail:
+        msg: >-
+          Aucun outil de mise à jour trouvé via SSH (synoupgrade/synoautoupdate).
+          Regarde la tâche "Chercher des binaires connus" pour voir ce qui existe.
+          Si rien n'apparait, on devra rester sur l'API DSM ou faire via interface DSM.
+      when: upgrade_tool in ["", "MISSING"]
+
+    - name: Debug outil choisi
+      ansible.builtin.debug:
+        msg: "Outil retenu: {{ upgrade_tool }}"
+
+    # ------------------------------------------------------------
+    # 2) Afficher l'aide (pour savoir quelles options existent)
+    # ------------------------------------------------------------
+    - name: Afficher --help de l'outil
+      ansible.builtin.shell: |
+        set +e
+        "{{ upgrade_tool }}" --help 2>&1 | head -n 120
+        exit 0
+      args:
+        executable: /bin/bash
+      register: tool_help
+      changed_when: false
+
+    - name: Debug help
+      ansible.builtin.debug:
+        var: tool_help.stdout_lines
+
+    # ------------------------------------------------------------
+    # 3) Tenter un check/download/start en best effort
+    # ------------------------------------------------------------
+    - name: Check MAJ (best effort)
+      ansible.builtin.shell: |
+        set +e
+        T="{{ upgrade_tool }}"
+
+        echo "---- TRY: check ----"
+        "$T" check 2>&1
+        rc1=$?
+
+        echo "---- TRY: --check ----"
+        "$T" --check 2>&1
+        rc2=$?
+
+        echo "---- TRY: status ----"
+        "$T" status 2>&1
+        rc3=$?
+
+        echo "---- TRY: --status ----"
+        "$T" --status 2>&1
+        rc4=$?
+
+        echo "RCs: check=$rc1 --check=$rc2 status=$rc3 --status=$rc4"
+        exit 0
+      args:
+        executable: /bin/bash
+      register: check_out
+      changed_when: false
+
+    - name: Afficher check
+      ansible.builtin.debug:
+        var: check_out.stdout_lines
+
+    - name: Heuristique update dispo
+      ansible.builtin.set_fact:
+        update_available: >-
+          {{
+            (
+              (check_out.stdout | lower).find('available') != -1
+              or (check_out.stdout | lower).find('update') != -1
+              or (check_out.stdout | lower).find('upgrade') != -1
+              or (check_out.stdout | lower).find('download') != -1
+              or (check_out.stdout | lower).find('télécharg') != -1
+              or (check_out.stdout | lower).find('dispon') != -1
+            )
+          }}
+
+    - name: Info update dispo
+      ansible.builtin.debug:
+        msg: "MAJ dispo (heuristique) = {{ update_available }}"
+
+    - name: Télécharger la MAJ (best effort)
+      ansible.builtin.shell: |
+        set +e
+        T="{{ upgrade_tool }}"
+
+        echo "---- TRY: download ----"
+        "$T" download 2>&1
+        rc1=$?
+
+        echo "---- TRY: --download ----"
+        "$T" --download 2>&1
+        rc2=$?
+
+        echo "---- TRY: download --start ----"
+        "$T" download --start 2>&1
+        rc3=$?
+
+        echo "RCs: download=$rc1 --download=$rc2 download--start=$rc3"
+        exit 0
+      args:
+        executable: /bin/bash
+      register: dl_out
+      changed_when: true
+      when: update_available | bool
+
+    - name: Afficher download
+      ansible.builtin.debug:
+        var: dl_out.stdout_lines
+      when: update_available | bool
+
+    - name: Installer (optionnel, best effort)
+      ansible.builtin.shell: |
+        set +e
+        T="{{ upgrade_tool }}"
+
+        echo "---- TRY: start ----"
+        "$T" start 2>&1
+        rc1=$?
+
+        echo "---- TRY: --start ----"
+        "$T" --start 2>&1
+        rc2=$?
+
+        echo "---- TRY: upgrade ----"
+        "$T" upgrade 2>&1
+        rc3=$?
+
+        echo "RCs: start=$rc1 --start=$rc2 upgrade=$rc3"
+        exit 0
+      args:
+        executable: /bin/bash
+      register: install_out
+      changed_when: true
+      when:
+        - update_available | bool
+        - do_install | bool
+
+    - name: Afficher install
+      ansible.builtin.debug:
+        var: install_out.stdout_lines
+      when:
+        - update_available | bool
+        - do_install | bool
+
+    - name: Reboot NAS (optionnel)
+      ansible.builtin.shell: |
+        sudo reboot || reboot
+      args:
+        executable: /bin/bash
+      when:
+        - update_available | bool
+        - do_install | bool
+        - do_reboot | bool