diff --git a/autosubmit_api/components/experiment/configuration_facade.py b/autosubmit_api/components/experiment/configuration_facade.py
index e349861b951145e6adaf007890af7e265ce6467c..910e3931290a05db00ba963ba05156a5fce140dc 100644
--- a/autosubmit_api/components/experiment/configuration_facade.py
+++ b/autosubmit_api/components/experiment/configuration_facade.py
@@ -153,7 +153,7 @@ class AutosubmitConfigurationFacade(ConfigurationFacade):
   def get_owner_name(self):
     # type: () -> str
     try:
-      _, stdout, _ = os.popen3("id -nu {0}".format(str(self.get_owner_id())))
+      stdout = os.popen("id -nu {0}".format(str(self.get_owner_id())))
       owner_name = stdout.read().strip()
       return str(owner_name)
     except:
diff --git a/autosubmit_api/config/config_common.py b/autosubmit_api/config/config_common.py
index ca5cc4bca38fddfe2ce6eb4abe2ea241d77550dc..bca8cb3039259c22b26d0a8b82abc65904067585 100644
--- a/autosubmit_api/config/config_common.py
+++ b/autosubmit_api/config/config_common.py
@@ -61,13 +61,13 @@ class AutosubmitConfig(object):
         self.parser_factory = parser_factory
 
         # check which type of config files (AS3 or AS4)
-        platform_conf_file = os.path.join(self.basic_config.LOCAL_ROOT_DIR, expid, "conf", "platforms_" + expid + "." + extension)
-        if os.path.exists(platform_conf_file):
-            logger.info("Setting AS4 Config strategy - yml")
-            self._configWrapper = ymlConfigStrategy(expid, basic_config, parser_factory, ".yml")
-        else:
+        expdef_conf_file = os.path.join(self.basic_config.LOCAL_ROOT_DIR, expid, "conf", "expdef_" + expid + ".conf")
+        if os.path.exists(expdef_conf_file):
             logger.info("Setting AS3 Config strategy - conf")
             self._configWrapper = confConfigStrategy(expid, basic_config, parser_factory, ".conf")
+        else:
+            logger.info("Setting AS4 Config strategy - yml")
+            self._configWrapper = ymlConfigStrategy(expid, basic_config, parser_factory, ".yml")
 
 
     @property
diff --git a/autosubmit_api/experiment/common_db_requests.py b/autosubmit_api/experiment/common_db_requests.py
index 247bf5910d28babaf9610cf7bd242e5f4e00ea95..7088eaf60bc8384711bc8e7811d9679cc79f0414 100644
--- a/autosubmit_api/experiment/common_db_requests.py
+++ b/autosubmit_api/experiment/common_db_requests.py
@@ -5,7 +5,7 @@ import time
 import pickle
 import textwrap
 import traceback
-import pysqlite3 as sqlite3
+import sqlite3
 import copy
 from datetime import datetime
 from collections import OrderedDict
diff --git a/autosubmit_api/workers/populate_details/populate.py b/autosubmit_api/workers/populate_details/populate.py
index 4fd6fc2ec4e9b232ce33cb81996b636ebbec613f..b59ce34eee16e562dfd8d607980a217e3c7a408b 100644
--- a/autosubmit_api/workers/populate_details/populate.py
+++ b/autosubmit_api/workers/populate_details/populate.py
@@ -8,9 +8,6 @@ from ...builders.configuration_facade_builder import ConfigurationFacadeDirector
 from ...config.basicConfig import BasicConfig
 from configparser import ParsingError
 from collections import namedtuple
-from pysqlite3 import dbapi2
-import pysqlite3 as sqlite3
-from pysqlite3 import Connection
 from typing import List, Dict, Any, Tuple
 
 ExperimentDetails = namedtuple("ExperimentDetails", ['owner', 'created', 'model', 'branch', 'hpc'])