diff --git a/hgdriver/hgdev/hg_ipc.cpp b/hgdriver/hgdev/hg_ipc.cpp
index 74de97a..88b5add 100644
--- a/hgdriver/hgdev/hg_ipc.cpp
+++ b/hgdriver/hgdev/hg_ipc.cpp
@@ -726,7 +726,28 @@ bool tiny_buffer::swap(void)
 
 	return ret;
 }
+int tiny_buffer::to_file(const char* file)
+{
+	FILE* dst = fopen(file, "wb");
 
+	if (!dst)
+		return errno;
+
+	unsigned int off = 0, len = size_;
+	unsigned char* buf = data(off, &len);
+	while (buf)
+	{
+		fwrite(buf, 1, len, dst);
+		off += len;
+		if (off >= size_)
+			break;
+		len = size_ - off;
+		buf = data(off, &len);
+	}
+	fclose(dst);
+
+	return 0;
+}
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // final_img_queue
diff --git a/hgdriver/hgdev/hg_ipc.h b/hgdriver/hgdev/hg_ipc.h
index 3bf1854..16fcf60 100644
--- a/hgdriver/hgdev/hg_ipc.h
+++ b/hgdriver/hgdev/hg_ipc.h
@@ -199,6 +199,7 @@ public:
 
     // mapping if unmapped; or unmapping if mapped
     bool swap(void);
+    int to_file(const char* file);
 };
 
 typedef struct _img_header
diff --git a/hgdriver/hgdev/hg_scanner_402.cpp b/hgdriver/hgdev/hg_scanner_402.cpp
index 983f52f..ff74394 100644
--- a/hgdriver/hgdev/hg_scanner_402.cpp
+++ b/hgdriver/hgdev/hg_scanner_402.cpp
@@ -1195,6 +1195,11 @@ int hg_scanner_402::read_one_image_from_usb(void)
 			VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "Read image from USB = %s\n", hg_scanner_err_name(ret));
 			if (ret == SCANNER_ERR_OK)
 			{
+				//{
+				//	char	f[128] = { 0 };
+				//	sprintf(f, "/tmp/usb_%02d.jpg", usb_img_index_);
+				//	buf->to_file(f);
+				//}
 				ret = save_usb_data(buf);
 				if (ret == SCANNER_ERR_OK)
 				{
@@ -1516,6 +1521,7 @@ void hg_scanner_402::thread_handle_usb_read(void)
 			break;
 		}
 		size = sizeof(buf);
+		memset(buf, 0, size);
 		{
 			std::lock_guard<std::mutex>      lock(io_lock_);
 
@@ -1626,11 +1632,18 @@ int hg_scanner_402::start(void)
 
 	reset();
 	get_roller_num();
+	read_register(SR_GET_PAPERON, &val);
+	if (!val)
+	{
+		VLOG_MINI_1(LOG_LEVEL_WARNING, "start failed: %s\n", hg_scanner_err_name(SCANNER_ERR_DEVICE_NO_PAPER));
+		return SCANNER_ERR_DEVICE_NO_PAPER;
+	}
 	notify_ui_working_status(STATU_DESC_REWRITE_CONFIGURATION);
 	writedown_device_configuration();
 	writedown_image_configuration();
+	val = 0;
 	ret = read_register(/*SR_GET_ANDROID_STATE*/0x1001, &val);
-	if (val)
+	while (val)
 	{
 		if (val == 1)
 			ret = status_ = SCANNER_ERR_DEVICE_COVER_OPENNED;
@@ -1639,9 +1652,12 @@ int hg_scanner_402::start(void)
 		else if (val == 3)
 			ret = status_ = SCANNER_ERR_DEVICE_NO_PAPER;
 		else
-			ret = status_ = SCANNER_ERR_IO;
+		{
+			VLOG_MINI_2(LOG_LEVEL_WARNING, "consider as success on SR_GET_ANDROID_STATE(%d) result: %s\n", val, hg_scanner_err_name(ret));
+			break;
+		}
 
-		VLOG_MINI_1(LOG_LEVEL_WARNING, "SR_GET_ANDROID_STATE result: %s\n", hg_scanner_err_name(ret));
+		VLOG_MINI_2(LOG_LEVEL_WARNING, "failed on SR_GET_ANDROID_STATE(%d) result: %s\n", val, hg_scanner_err_name(ret));
 		return ret;
 	}
 	write_register(0x1000, scan_count_);
@@ -1678,7 +1694,7 @@ int hg_scanner_402::stop(void)
 int hg_scanner_402::reset(void)
 {
 	final_imgs_.clear();
-	//discard_all_images();
+	discard_all_images();
 
 	return status_;
 }