diff --git a/src/Components/Ble/DfuService.cpp b/src/Components/Ble/DfuService.cpp
index 5b51ad31..107304a9 100644
--- a/src/Components/Ble/DfuService.cpp
+++ b/src/Components/Ble/DfuService.cpp
@@ -86,30 +86,90 @@ int DfuService::OnServiceData(uint16_t connectionHandle, uint16_t attributeHandl
   }
 
   if(attributeHandle == packetCharacteristicHandle) {
-    NRF_LOG_INFO("[DFU] Packet Characteristic : %d - %s", attributeHandle, op);
+    NRF_LOG_INFO("[DFU] %s Packet", op);
     if(context->op == BLE_GATT_ACCESS_OP_WRITE_CHR) {
-      NRF_LOG_INFO("[DFU] -> Write  %dB", context->om->om_len);
-      uint8_t data[3] {16, 1, 1};
-      auto* om = ble_hs_mbuf_from_flat(data, 3);
-      ble_gattc_notify_custom(connectionHandle, controlPointCharacteristicHandle, om);
+//      NRF_LOG_INFO("[DFU] -> Write  %dB", context->om->om_len);
+      if(opcode == 1) {
+        uint8_t data[3]{16, opcode, param};
+        NRF_LOG_INFO("[DFU] -> Send notification: {%d, %d, %d}", data[0], data[1], data[2]);
+
+        auto *om = ble_hs_mbuf_from_flat(data, 3);
+        ble_gattc_notify_custom(connectionHandle, controlPointCharacteristicHandle, om);
+      }
+      if(dataMode){
+        nbPacketReceived++;
+        bytesReceived += context->om->om_len;
+        NRF_LOG_INFO("[DFU] -> Bytes received : %d in %d packets", bytesReceived, nbPacketReceived);
+
+        if((nbPacketReceived % nbPacketsToNotify) == 0) {
+          uint8_t data[5]{17, (uint8_t)(bytesReceived>>24),(uint8_t)(bytesReceived>>16), (uint8_t)(bytesReceived>>8), (uint8_t)(bytesReceived&0x000000FF) };
+          NRF_LOG_INFO("[DFU] -> Send packet notification: %d bytes received",bytesReceived);
+
+          auto *om = ble_hs_mbuf_from_flat(data, 5);
+          ble_gattc_notify_custom(connectionHandle, controlPointCharacteristicHandle, om);
+        }
+        if(bytesReceived == 175280) {
+          uint8_t data[3]{16, 3, 1};
+          NRF_LOG_INFO("[DFU] -> Send packet notification : all bytes received!");
+
+          auto *om = ble_hs_mbuf_from_flat(data, 3);
+          ble_gattc_notify_custom(connectionHandle, controlPointCharacteristicHandle, om);
+        }
+      }
+
     }
   } else if (attributeHandle == controlPointCharacteristicHandle) {
-    NRF_LOG_INFO("[DFU] ControlPoint Characteristic : %d - %s", attributeHandle, op);
+    NRF_LOG_INFO("[DFU] %s ControlPoint", op);
     if(context->op == BLE_GATT_ACCESS_OP_WRITE_CHR) {
-      NRF_LOG_INFO("[DFU] -> Write  %dB", context->om->om_len);
+//      NRF_LOG_INFO("[DFU] -> Write  %dB {%d, %d}", context->om->om_len, context->om->om_data[0], context->om->om_data[1]);
       switch(context->om->om_data[0]) {
         case 0x01: {// START DFU
           NRF_LOG_INFO("[DFU] -> Start DFU, mode = %d", context->om->om_data[1]);
-
+          opcode = 0x01;
+          param = 1;
         }
+          break;
+        case 0x02:
+          NRF_LOG_INFO("[DFU] -> Receive init, state (0=RX, 1=Complete) = %d", context->om->om_data[1]);
+          opcode = 0x02;
+          param = context->om->om_data[1];
+          if(param == 1) {
+            uint8_t data[3] {16, opcode, param};
+            NRF_LOG_INFO("[DFU] -> Send notification: {%d, %d, %d}", data[0], data[1], data[2]);
 
+            auto *om = ble_hs_mbuf_from_flat(data, 3);
+
+            ble_gattc_notify_custom(connectionHandle, controlPointCharacteristicHandle, om);
+          }
+          break;
+        case 0x08:
+          nbPacketsToNotify = context->om->om_data[1];
+          NRF_LOG_INFO("[DFU] -> Receive Packet Notification Request, nb packet = %d", nbPacketsToNotify);
+          break;
+        case 0x03:
+          NRF_LOG_INFO("[DFU] -> Starting receive firmware");
+          dataMode = true;
+          break;
+        case 0x04: {
+          NRF_LOG_INFO("[DFU] -> Validate firmware");
+          uint8_t data[3]{16, 4, 1};
+          NRF_LOG_INFO("[DFU] -> Send notification: {%d, %d, %d}", data[0], data[1], data[2]);
+
+          auto *om = ble_hs_mbuf_from_flat(data, 3);
+
+          ble_gattc_notify_custom(connectionHandle, controlPointCharacteristicHandle, om);
+        }
+          break;
+        case 0x05:
+          NRF_LOG_INFO("[DFU] -> Activate image and reset!");
           break;
       }
 
+
     }
 
   } else if(attributeHandle == revisionCharacteristicHandle) {
-    NRF_LOG_INFO("[DFU] Revision Characteristic : %d - %s", attributeHandle, op);
+    NRF_LOG_INFO("[DFU] %s Revision", op);
     if(context->op == BLE_GATT_ACCESS_OP_READ_CHR) {
       int res = os_mbuf_append(context->om, &revision, 2);
       return (res == 0) ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
diff --git a/src/Components/Ble/DfuService.h b/src/Components/Ble/DfuService.h
index 221b6e89..bb643632 100644
--- a/src/Components/Ble/DfuService.h
+++ b/src/Components/Ble/DfuService.h
@@ -51,6 +51,12 @@ namespace Pinetime {
         uint16_t packetCharacteristicHandle;
         uint16_t controlPointCharacteristicHandle;
         uint16_t revisionCharacteristicHandle;
+        uint8_t opcode = 0;
+        uint8_t param = 0;
+        uint8_t nbPacketsToNotify = 0;
+        uint32_t nbPacketReceived = 0;
+        bool dataMode = false;
+        uint32_t bytesReceived = 0;
     };
   }
 }
\ No newline at end of file
diff --git a/src/Components/Ble/NimbleController.cpp b/src/Components/Ble/NimbleController.cpp
index 98246b7f..ccb1e6ad 100644
--- a/src/Components/Ble/NimbleController.cpp
+++ b/src/Components/Ble/NimbleController.cpp
@@ -231,7 +231,7 @@ int NimbleController::OnGAPEvent(ble_gap_event *event) {
       /* Attribute data is contained in event->notify_rx.attr_data. */
 
     default:
-      NRF_LOG_INFO("Advertising event : %d", event->type);
+//      NRF_LOG_INFO("Advertising event : %d", event->type);
       break;
   }
   return 0;