Change wording to include older firmware

src/QGCApplication.cc

@@ -633,7 +633,7 @@ void QGCApplication::_missingParamsDisplay(void)
     }
     _missingParams.clear();
 
-    showMessage(QString("Parameters missing from firmware: %1.\n\nYou should quit QGroundControl immediately and update your firmware.").arg(params));
+    showMessage(QString("Parameters missing from firmware: %1. You may be running an older version of firmware QGC does not work correctly with or your firmware has a bug in it.").arg(params));
 }
 
 QObject* QGCApplication::_rootQmlObject(void)