diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index 0348a1371131583c9be04d1a4f967f7767275abe..0d50b80609ce9ddb7092a53e8c488e11792158bc 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -385,7 +385,7 @@ class CsstMsDataManager:
             raise FileNotFoundError(f"No file found with pattern {pattern} in {dir_l0}")
 
         # parse filename
-        elif ver_sim in ["C5.2", "C6.1"]:
+        if ver_sim in ["C5.2", "C6.1"]:
             pattern = re.compile(
                 r"(?P<telescope>[A-Z]+)_"
                 r"(?P<instrument>[A-Z]+)_"