diff --git a/bootloader/USB_DEVICE/App/usb_device.c b/bootloader/USB_DEVICE/App/usb_device.c
index 71d8870..e0ff9ae 100644
--- a/bootloader/USB_DEVICE/App/usb_device.c
+++ b/bootloader/USB_DEVICE/App/usb_device.c
@@ -55,6 +55,12 @@ USBD_HandleTypeDef hUsbDeviceFS;
  */
 /* USER CODE BEGIN 1 */
 
+void USER_USB_DEVICE_DeInit(void)
+{
+  USBD_Stop(&hUsbDeviceFS);
+  USBD_DeInit(&hUsbDeviceFS);
+}
+
 /* USER CODE END 1 */
 
 /**
diff --git a/bootloader/USB_DEVICE/App/usb_device.h b/bootloader/USB_DEVICE/App/usb_device.h
index 63f0a57..838f48c 100644
--- a/bootloader/USB_DEVICE/App/usb_device.h
+++ b/bootloader/USB_DEVICE/App/usb_device.h
@@ -81,7 +81,7 @@ void MX_USB_DEVICE_Init(void);
  * -- Insert functions declaration here --
  */
 /* USER CODE BEGIN FD */
-
+void USER_USB_DEVICE_DeInit(void);
 /* USER CODE END FD */
 /**
   * @}