diff --git a/.kiro/steering/debug-reclassification.md b/.kiro/steering/debug-reclassification.md
new file mode 100644
index 0000000..5ce378d
--- /dev/null
+++ b/.kiro/steering/debug-reclassification.md
@@ -0,0 +1,137 @@
+# Debug: Reclassification Properties → Parameters
+
+## Contexte du problème
+
+Les paramètres `Device.ManagementServer.PeriodicInformInterval` et `Device.DeviceInfo.ProvisioningCode` apparaissent comme **properties** (read-only) dans l'interface alors qu'ils devraient être des **parameters** (writable).
+
+Le catalogue `config/tr181-catalog.json` les marque bien comme `writable: true`.
+La fonction `reclassifyDeviceFromCatalog()` dans `app/services/parameter_writability.ts` est censée les déplacer de properties vers parameters quand `gpnStatus === 'unsupported'`.
+
+Le dernier log de debug montre : `[Reclassify] properties=9, reclassified=0, catalogSize=2953` — la fonction est appelée mais ne reclassifie rien malgré les paths présents dans le catalogue.
+
+## Fichiers impliqués
+
+- `app/services/parameter_writability.ts` — contient `reclassifyDeviceFromCatalog()` et `normalizePath()`
+- `app/services/cwmp/device_action_executor.ts` — appelle la reclassification quand GPN échoue
+- `app/services/cwmp/main_state_machine.ts` — `CompletedState` appelle aussi la reclassification
+- `app/controllers/cwmp_controller.ts` — `handleInform()` appelle la reclassification si `gpnStatus === 'unsupported'`
+- `app/domain/device/device.ts` — `updateFromValues()` stocke les nouveaux params comme properties par défaut
+- `config/tr181-catalog.json` — référentiel de writabilité TR-181
+
+## Procédure de test complète
+
+### 1. Faire la modification de code
+
+Modifier le fichier concerné, puis vérifier la compilation :
+
+```bash
+npx tsc --noEmit
+```
+
+### 2. Build et relance Docker
+
+```bash
+docker compose build app
+docker compose up -d app
+```
+
+Attendre que l'app soit healthy :
+
+```bash
+docker compose logs app --tail 5
+```
+
+### 3. Supprimer le device Sagemcom de l'ACS
+
+```bash
+curl -s -X DELETE http://localhost:8080/api/v1/devices/2e933565b8fc09f34f42531e
+```
+
+### 4. Supprimer le device du simulateur (home-device-simulator)
+
+```bash
+curl -s -X DELETE "http://localhost:9898/api/v1/device-simulator/delete-devices" \
+  -H 'Content-Type: application/json' \
+  -d '["F8:B7:FF:00:11:22"]'
+```
+
+### 5. Recréer le device dans le simulateur
+
+```bash
+curl -s -X PUT "http://localhost:9898/api/v1/device-simulator/create-devices?noOfDevices=1&autoGenerate=false&ipAddressType=ipv4" \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "manufacturer": "Sagemcom",
+    "oui": "F8B7FF",
+    "productClass": "Livebox 4",
+    "serialNumber": "LB4-TEST-001",
+    "macaddress": "F8:B7:FF:00:11:22",
+    "parameters": [
+      {"type": "Manufacturer", "model": "Device.DeviceInfo.Manufacturer", "value": "Sagemcom"},
+      {"type": "ManufacturerOUI", "model": "Device.DeviceInfo.ManufacturerOUI", "value": "F8B7FF"},
+      {"type": "ModelName", "model": "Device.DeviceInfo.ModelName", "value": "Livebox 4"},
+      {"type": "ProductClass", "model": "Device.DeviceInfo.ProductClass", "value": "Livebox 4"},
+      {"type": "SerialNumber", "model": "Device.DeviceInfo.SerialNumber", "value": "LB4-TEST-001"},
+      {"type": "HardwareVersion", "model": "Device.DeviceInfo.HardwareVersion", "value": "SR40_sip-fr-4.62.0"},
+      {"type": "SoftwareVersion", "model": "Device.DeviceInfo.SoftwareVersion", "value": "SR40_sip-fr-4.62.0"}
+    ]
+  }'
+```
+
+### 6. Attendre l'Inform (30s max) puis vérifier
+
+```bash
+sleep 30
+```
+
+Vérifier la classification :
+
+```bash
+curl -s "http://localhost:8080/api/v1/devices/2e933565b8fc09f34f42531e" | \
+  python3 -c "
+import sys,json
+d=json.load(sys.stdin)
+print('gpnStatus:', d.get('gpnStatus'))
+props = [p['name'] for p in d.get('properties',[]) if 'PeriodicInform' in p['name'] or 'ProvisioningCode' in p['name']]
+params = [p['name'] for p in d.get('parameters',[]) if 'PeriodicInform' in p['name'] or 'ProvisioningCode' in p['name']]
+print('Dans properties (MAUVAIS):', props)
+print('Dans parameters (BON):', params)
+"
+```
+
+### 7. Regarder les logs de reclassification
+
+```bash
+docker compose logs app --tail 50 2>&1 | grep -i "reclassify\|Reclassify"
+```
+
+## Résultat attendu
+
+```
+gpnStatus: unsupported
+Dans properties (MAUVAIS): []
+Dans parameters (BON): ['Device.ManagementServer.PeriodicInformInterval', 'Device.DeviceInfo.ProvisioningCode']
+```
+
+## Identifiants du device de test
+
+| Champ | Valeur |
+|-------|--------|
+| ACS identifier | `2e933565b8fc09f34f42531e` |
+| Manufacturer | Sagemcom |
+| OUI | F8B7FF |
+| Product Class | Livebox 4 |
+| Serial Number | LB4-TEST-001 |
+| MAC (simulateur) | F8:B7:FF:00:11:22 |
+| Data Model | tr-181 |
+
+## API du simulateur
+
+- Base URL : `http://localhost:9898/api/v1/device-simulator`
+- Swagger : `http://localhost:9898/swagger/`
+- Suppression par MAC : `DELETE /delete-devices` body `["MAC"]`
+- Création : `PUT /create-devices?noOfDevices=1&autoGenerate=false&ipAddressType=ipv4`
+
+## Trace TR-069
+
+Le device est déjà dans la config de trace (`data/tr069-trace.json` dans le volume Docker `app_tr069_data`). Les logs SOAP sont visibles sur `http://localhost:8080/tr069-trace`.
diff --git a/app/services/cwmp/configuration_evaluation_state.ts b/app/services/cwmp/configuration_evaluation_state.ts
index 58392fe..953db7e 100644
--- a/app/services/cwmp/configuration_evaluation_state.ts
+++ b/app/services/cwmp/configuration_evaluation_state.ts
@@ -108,7 +108,8 @@ export class ConfigurationEvaluationState {
       )
       return { response }
     } else if (this.inventoryQueue.length > 0) {
-      // GPN unsupported — clear inventory queue and skip to next phase
+      // GPN unsupported — skip inventory (GPV on object paths also fails on most simulators)
+      // Parameters will be discovered via Inform values and SPV responses
       logger.debug({ identifier: context.device.identifier, skipped: this.inventoryQueue.length }, '[ConfigEval] Skipping inventory (GPN unsupported)')
       this.inventoryQueue = []
     }
diff --git a/app/services/cwmp/device_action_executor.ts b/app/services/cwmp/device_action_executor.ts
index c8294f5..7a1009f 100644
--- a/app/services/cwmp/device_action_executor.ts
+++ b/app/services/cwmp/device_action_executor.ts
@@ -98,6 +98,9 @@ export class DeviceActionExecutor {
           const list = resp?.ParameterList?.ParameterValueStruct
           if (Array.isArray(list) && list.length > 0) {
             device.updateFromValues(list)
+            if (device.gpnStatus === 'unsupported') {
+              reclassifyDeviceFromCatalog(device)
+            }
             await this.persistDevice(device)
           }
         } catch (e) {
@@ -235,6 +238,9 @@ export class DeviceActionExecutor {
       async (result: TaskResult) => {
         if (result.status === ResultStatus.Success) {
           device.updateFromValues(pvStructs as any)
+          if (device.gpnStatus === 'unsupported') {
+            reclassifyDeviceFromCatalog(device)
+          }
           await this.persistDevice(device)
           return await callback(true)
         }
@@ -396,6 +402,9 @@ export class DeviceActionExecutor {
       async (result: TaskResult) => {
         if (result.status === ResultStatus.Success) {
           device.updateFromValues(pvStructs as any)
+          if (device.gpnStatus === 'unsupported') {
+            reclassifyDeviceFromCatalog(device)
+          }
           await this.persistDevice(device)
           device.tmpPC = ''
           return await callback(true)
diff --git a/app/services/cwmp/main_state_machine.ts b/app/services/cwmp/main_state_machine.ts
index a68edb7..5925db8 100644
--- a/app/services/cwmp/main_state_machine.ts
+++ b/app/services/cwmp/main_state_machine.ts
@@ -8,6 +8,7 @@ import CommandModel from '../../models/command.js'
 import { ModeType } from '../../domain/shared/mode.js'
 import logger from '@adonisjs/core/services/logger'
 import { ConfigurationEvaluationState } from './configuration_evaluation_state.js'
+import { reclassifyDeviceFromCatalog } from '../parameter_writability.js'
 
 // ─── Interfaces ────────────────────────────────────────────────────────────────
 
@@ -277,6 +278,11 @@ class CompletedState extends DeviceState {
   name = 'completed'
 
   async handle(context: DeviceContext): Promise<DeviceStateResult> {
+    // Reclassify properties → parameters if GPN is unsupported
+    if (context.device.gpnStatus === 'unsupported') {
+      reclassifyDeviceFromCatalog(context.device)
+    }
+
     // Persist device on completion
     try {
       const snapshot = context.device.toSnapshot()