diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index b480774..670327f 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -356,9 +356,13 @@ void hg_scanner::thread_read_int(void)
 }
 void hg_scanner::thread_handle_usb(void)
 {
+	int cnt = 0;
+	VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "[thread_handle_usb 'START' !!!]:[%d]\n", cnt);
 	while (run_)
 	{
+		VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "[thread_handle_usb 'WAIT' !!!]:[%d]\n", cnt);
 		wait_usb_.wait();
+		VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "[thread_handle_usb 'NOTIFY' !!!]:[%d]\n", cnt);
 		if (!run_)
 			break;
 
@@ -367,7 +371,7 @@ void hg_scanner::thread_handle_usb(void)
 			std::this_thread::sleep_for(std::chrono::milliseconds(3000));
 			if (scan_life_)
 			{
-				LOG_INFO(LOG_LEVEL_FATAL, "image process is still running!\n");
+				VLOG_MINI_1(LOG_LEVEL_FATAL, "[thread_handle_usb image process is still running!]:[%d]\n", cnt);
 				continue;
 			}
 		}
@@ -377,7 +381,11 @@ void hg_scanner::thread_handle_usb(void)
 		thread_handle_usb_read();
 		if (scan_life_->release() == 0)
 			scan_life_ = NULL;
+
+		VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "[thread_handle_usb_read 'GET IMAGE END'!!!]:[%d]\n", cnt);
+		cnt++;
 	}
+	VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "[thread_handle_usb EXIT !!!]:[%d]\n", cnt);
 }
 void hg_scanner::thread_image_handle(void)
 {
diff --git a/hgdriver/hgdev/hg_scanner_239.cpp b/hgdriver/hgdev/hg_scanner_239.cpp
index a8c8610..272b081 100644
--- a/hgdriver/hgdev/hg_scanner_239.cpp
+++ b/hgdriver/hgdev/hg_scanner_239.cpp
@@ -1323,10 +1323,14 @@ void hg_scanner_239::thread_handle_usb_read(void)
 
 int hg_scanner_239::start(void)
 {
-	if (is_read_int)
+	StopWatch sw;
+	while (is_read_int)
 	{
-		VLOG_MINI_1(LOG_LEVEL_WARNING, "device  status is(%s)\n", hg_log::lang_load(ID_STATU_DESC_SCANNER_ERR_DEVICE_BUSY));
-		return SCANNER_ERR_DEVICE_DEVS_BOOTING;
+		if (sw.elapsed_s() > 10)
+		{
+			break;
+		}
+		VLOG_MINI_1(LOG_LEVEL_WARNING, "device  status is(%s)\n", STATU_DESC_SCANNER_ERR_DEVICE_DEVS_BOOTING);
 	}
 	bool	handled = false;
 	int		ret = try_third_app_handle_start(handled),
diff --git a/hgdriver/hgdev/hg_scanner_300.cpp b/hgdriver/hgdev/hg_scanner_300.cpp
index 4ad9407..1e4227e 100644
--- a/hgdriver/hgdev/hg_scanner_300.cpp
+++ b/hgdriver/hgdev/hg_scanner_300.cpp
@@ -127,7 +127,7 @@ void hg_scanner_300::thread_handle_usb_read(void)
 					status_ = ret = SCANNER_ERR_USER_CANCELED;
 				VLOG_MINI_2(LOG_LEVEL_DEBUG_INFO, "%s:%s\n", hg_log::lang_load(ID_STATU_DESC_SCANNER_ERR_DEVICE_GET_USER_CANCEL_SCAN), hg_scanner_err_name(status_));
 			}
-			VLOG_MINI_2(LOG_LEVEL_DEBUG_INFO, "%s:%s\n", "'STOPSCAN' message in usb thread\n" , hg_scanner_err_name(status_));
+			VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO,  "'STOPSCAN' message in usb thread:%s\n" , hg_scanner_err_name(status_));
 
 			break;
 		}
@@ -269,7 +269,7 @@ int hg_scanner_300::discard_all_images(void)
 			std::lock_guard<std::mutex>      lock(io_lock_);
 			int ret = io_->read_bulk(&str[0], &block);
 		}
-		while (ret != SCANNER_ERR_TIMEOUT)
+		while (ret == SCANNER_ERR_OK)
 		{
 			cnt++;
 			{
@@ -292,12 +292,20 @@ int hg_scanner_300::discard_all_images(void)
 }
 int hg_scanner_300::start(void)
 {
-	if (is_read_int)
+	//if (is_read_int)
+	//{
+	//	VLOG_MINI_1(LOG_LEVEL_WARNING, "device  status is(%s)\n", STATU_DESC_SCANNER_ERR_DEVICE_DEVS_BOOTING);
+	//	return SCANNER_ERR_DEVICE_DEVS_BOOTING;
+	//}
+	StopWatch sw;
+	while (is_read_int)
 	{
+		if (sw.elapsed_s() > 10)
+		{
+			break;
+		}
 		VLOG_MINI_1(LOG_LEVEL_WARNING, "device  status is(%s)\n", STATU_DESC_SCANNER_ERR_DEVICE_DEVS_BOOTING);
-		return SCANNER_ERR_DEVICE_DEVS_BOOTING;
 	}
-
 	//discard_all_images();
 	bool	handled = false;
 	int		ret = try_third_app_handle_start(handled),