diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index e903a848a3095e79cc1efea33aeedf6007b71013..1852fc3520c0f89a38129e18fc263114048f50e5 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -755,6 +755,7 @@ class CsstMsDataManager:
     @staticmethod
     def from_dfs(
             obs_id="100000100",
+            ver_sim="C5.2",
             datatype="mbi",
             dir_l0="/L1Pipeline/L0",
             dir_l1="/L1Pipeline/L1",
@@ -798,7 +799,7 @@ class CsstMsDataManager:
 
         # initialize dm
         dm = CsstMsDataManager.from_dir(
-            ver_sim="C5.2",
+            ver_sim=ver_sim,
             datatype=datatype,
             dir_l0=dir_l0,
             dir_l1=dir_l1,