diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index 61fbdbf4655f58e65d002d33a8db555c00289b3e..82a2b8225db20b8a5aebb84fda8435574165d7b4 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -156,20 +156,20 @@ class CsstMbiDataManager:
                 self._instrument, self._cat_id, self._exp_id - 100000000, detector)
         elif self.ver_sim == "C5.1":
             fn = "{}_{}_chip_{:02d}_filt_{}.cat".format(
-                self._instrument, self._exp_id - 90000000, detector, CP["mbi"]["detector2filter"])
+                self._instrument, self._exp_id - 90000000, detector, CP["mbi"]["detector2filter"][detector])
         elif self.ver_sim == "C5.2":
             fn = "{}_{}_chip_{:02d}_filt_{}.cat".format(
-                self._instrument, self._exp_id, detector, CP["mbi"]["detector2filter"])
+                self._instrument, self._exp_id, detector, CP["mbi"]["detector2filter"][detector])
         return os.path.join(self.dir_l0, fn)
 
     def l0_log(self, detector=6):
         """ L0 log file path """
         if self.ver_sim == "C5.1":
             fn = "{}_{}_chip_{:02d}_filt_{}.log".format(
-                self._instrument, self._exp_id - 90000000, detector, CP["mbi"]["detector2filter"])
+                self._instrument, self._exp_id - 90000000, detector, CP["mbi"]["detector2filter"][detector])
         elif self.ver_sim == "C5.2":
             fn = "{}_{}_chip_{:02d}_filt_{}.log".format(
-                self._instrument, self._exp_id, detector, CP["mbi"]["detector2filter"])
+                self._instrument, self._exp_id, detector, CP["mbi"]["detector2filter"][detector])
         return os.path.join(self.dir_l0, fn)
 
     def l0_detector(self, detector=6):