diff --git a/iosfw/iosfw.py b/iosfw/iosfw.py
index 1397d01..8389bee 100755
--- a/iosfw/iosfw.py
+++ b/iosfw/iosfw.py
@@ -426,9 +426,9 @@ def _get_image_install_mode(self):
         """ Returns either install or bundle """
         cmd = "show version"
         output = self.device.send_command(cmd)
-        if "INSTALL" in output:
+        if "INSTALL" in output or 'packages.conf' in output:
             return "install"
-        if "BUNDLE" in output:
+        else:
             return "bundle"
 
     def _check_image_feature_set(self, file_name):