diff --git a/hgdriver/hgdev/hg_scanner_300.cpp b/hgdriver/hgdev/hg_scanner_300.cpp
index 9ac8507..fbb6f26 100644
--- a/hgdriver/hgdev/hg_scanner_300.cpp
+++ b/hgdriver/hgdev/hg_scanner_300.cpp
@@ -70,11 +70,13 @@ hg_scanner_300::hg_scanner_300(const char* dev_name,int pid, usb_io* io) : hg_sc
 {
 	pid_ = pid;
 	string fw = get_firmware_version();
-
-	if (atoi(fw.substr(4, 9).c_str()) >= 221106)
-		is_kernelsnap3288_221106_ = true;
-	else
-		is_kernelsnap3288_221106_ = false;
+	if (fw.size() > 0)
+	{
+		if (atoi(fw.substr(6, 4).c_str()) >= 1106)
+			is_kernelsnap3288_221106_ = true;
+		else
+			is_kernelsnap3288_221106_ = false;
+	}
 	initdevice();
 #ifndef MAPPING_FUNCTION_IN_BASE
 	init_setting_map(setting_map_, ARRAY_SIZE(setting_map_));//优先初始化