diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index 2ef5956d6b55b1779576a3bf44a0a418b77c3bef..6bb884f3245ab74daed1afb0bff722e011e05a81 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -544,7 +544,7 @@ class CsstMsDataManager:
         if self.custom_bias is None:
             return os.path.join(
                 self.path_aux,
-                "C6.1_ref_crds",
+                "C6.2_ref_crds",
                 "csst_msc_{}_{:02d}_{:04d}.fits".format(
                     "bias", detector, 1 if self.ref_version is None else self.ref_version
                 )
@@ -557,7 +557,7 @@ class CsstMsDataManager:
         if self.custom_dark is None:
             return os.path.join(
                 self.path_aux,
-                "C6.1_ref_crds",
+                "C6.2_ref_crds",
                 "csst_msc_{}_{:02d}_{:04d}.fits".format(
                     "dark", detector, 1 if self.ref_version is None else self.ref_version
                 )
@@ -570,7 +570,7 @@ class CsstMsDataManager:
         if self.custom_flat is None:
             return os.path.join(
                 self.path_aux,
-                "C6.1_ref_crds",
+                "C6.2_ref_crds",
                 "csst_msc_{}_{:02d}_{:04d}.fits".format(
                     "flat", detector, 1 if self.ref_version is None else self.ref_version
                 )
@@ -1017,6 +1017,7 @@ class CsstMsFile(dict):
         self.dir_out = dir_out
 
         # parse filename
+        # CSST_MSC_MS_SCIE_20270713222417_20270713222647_10160000066_01_L0_V01.fits
         pattern = re.compile(
             r"(?P<telescope>[A-Z]+)_"
             r"(?P<instrument>[A-Z]+)_"