diff --git a/Application.cpp b/Application.cpp
index 77f0fe8..1001deb 100644
--- a/Application.cpp
+++ b/Application.cpp
@@ -258,9 +258,10 @@ void Application::upgradeDevice(const QString &file) {
     int position = baseName.indexOf(versionPrefix);
     if (position < 0 || ((baseName.length() - position) < std::strlen(version))) {
         emit newMessage(2, "OTA升级", "文件名格式不合法!");
+        LOG(error) << "baseName: " << baseName.toStdString() << ", position: " << position;
         return;
     }
-    QString firmware = baseName.mid(position, std::strlen(version));
+    QString firmware = baseName.mid(position);
     if (device->isConnected()) {
         device->requestOta(firmware, file);
     } else {