diff --git a/scripts/ble_library.py b/scripts/ble_library.py
index 5ab4e416c..867462e33 100644
--- a/scripts/ble_library.py
+++ b/scripts/ble_library.py
@@ -136,9 +136,9 @@ def build_patch_from_current_zephyr_version(
 
     temp_source_lib_path = Path(temp_source_path / "lib")
 
-    # reset the STM32Cube repo to this current version
+    # Checkout the current Zephyr version of the STM32Cube repo
     os_cmd(
-        ("git", "reset", "--hard", version),
+        ("git", "checkout", "-f", "--recurse-submodules", version),
         cwd=src_repo_path,
     )
 
@@ -218,9 +218,9 @@ def update(
     build_patch_from_current_zephyr_version(
         src_repo_path, temp_source_path, dest_lib_path, current_version
     )
-    # reset the STM32Cube repo to this update version
+    # Checkout the latest version of the STM32Cube repo
     os_cmd(
-        ("git", "reset", "--hard", update_version),
+        ("git", "checkout", "-f", "--recurse-submodules", update_version),
         cwd=src_repo_path,
     )
     copy_hci_files(src_repo_path, dest_lib_path)
diff --git a/scripts/serie_update.py b/scripts/serie_update.py
index a832aa474..67e979228 100644
--- a/scripts/serie_update.py
+++ b/scripts/serie_update.py
@@ -87,7 +87,7 @@ def __init__(
 
         # #####  3 root directories to work with ########
         # 1: STM32Cube repo Default $HOME/STM32Cube_repo
-        # 2 : zephyr stm32 path  : ex: .../zephyr_project/module/hal/stm32
+        # 2: zephyr stm32 path  : ex: .../zephyr_project/module/hal/stm32
         # 3: Temporary directory to construct the update
         # (within STM32Cube repo dir)
         self.stm32cube_repo_path = stm32cube_repo_path
@@ -105,7 +105,7 @@ def __init__(
             )
         self.stm32cube_temp.mkdir()
 
-        # subdir specific to a stm32 serie
+        # subdir specific to an stm32 serie
         self.stm32cube_serie_path = self.stm32cube_repo_path / Path(
             "STM32Cube" + self.serie
         )
@@ -192,14 +192,26 @@ def clone_cube_repo(self):
             # if already exists, then just clean and fetch
             self.os_cmd(("git", "clean", "-fdx"), cwd=self.stm32cube_serie_path)
             self.os_cmd(("git", "fetch"), cwd=self.stm32cube_serie_path)
+            # this is useful when HAL/CMSIS Device drivers submodules are not
+            # already present locally, otherwise "git fetch" is sufficient
+            self.os_cmd(("git", "submodule", "update", "--init"),
+                cwd=self.stm32cube_serie_path)
             branch = self.major_branch()
+            # "Using --recurse-submodules will update the content of all active
+            # submodules according to the commit recorded in the superproject.
+            # If local modifications in a submodule would be overwritten the
+            # checkout will fail unless -f is used."
+            # https://git-scm.com/docs/git-checkout
             self.os_cmd(
-                ("git", "reset", "--hard", branch),
+                ("git", "checkout", "-f", "--recurse-submodules", branch),
                 cwd=self.stm32cube_serie_path,
             )
         else:
+            # HAL & CMSIS Device drivers are now included as git submodules in
+            # upstream STM32Cube GitHub repositories
+            # So to get them too, --recursive or --recurse-submodules is needed
             self.os_cmd(
-                ("git", "clone", repo_name),
+                ("git", "clone", "--recursive", repo_name),
                 cwd=self.stm32cube_repo_path,
             )
             branch = self.major_branch()
@@ -260,6 +272,7 @@ def extract_source(self):
         # for CMSIS files
         temp_cmsis_soc_path = self.stm32cube_temp_serie / "soc"
         Path.mkdir(temp_cmsis_soc_path, parents=True)
+
         stm32cube_cmsis_include_path = (
             self.stm32cube_serie_path
             / "Drivers"
@@ -290,6 +303,7 @@ def extract_source(self):
         # for hal and ll drivers
         temp_drivers_include_path = self.stm32cube_temp_serie / "drivers" / "include"
         temp_drivers_include_path.parent.mkdir(parents=True)
+
         stm32cube_driver_inc = (
             self.stm32cube_serie_path
             / "Drivers"
@@ -320,9 +334,9 @@ def build_from_current_cube_version(self):
         """Build a commit in temporary dir with STM32Cube version
         corresponding to zephyr current hal version
         """
-        # reset the STM32Cube repo to this current version
+        # Checkout the current Zephyr version of the STM32Cube repo
         self.os_cmd(
-            ("git", "reset", "--hard", self.current_version),
+            ("git", "checkout", "-f", "--recurse-submodules", self.current_version),
             cwd=self.stm32cube_serie_path,
         )
 
@@ -565,9 +579,9 @@ def build_from_version_update(self):
         """Build a commit in temporary dir with STM32Cube version
         corresponding to zephyr latest hal version
         """
-        # reset the STM32Cube repo to this latest version
+        # Checkout the latest version of the upstream STM32Cube repo
         self.os_cmd(
-            ("git", "reset", "--hard", self.version_update),
+            ("git", "checkout", "-f", "--recurse-submodules", self.version_update),
             cwd=self.stm32cube_serie_path,
         )
 
@@ -693,7 +707,8 @@ def reject(self):
 
     def cleanup_stm32cube_repo(self):
         """clean the STM32Cube repo"""
-        self.os_cmd(("git", "reset", "--hard", "HEAD"), cwd=self.stm32cube_serie_path)
+        self.os_cmd(("git", "checkout", "-f", "--recurse-submodules", "HEAD"),
+            cwd=self.stm32cube_serie_path)
 
     def clean_files(self):
         """Clean repo file if required"""
@@ -709,7 +724,7 @@ def clean_files(self):
             )
         else:
             self.os_cmd(
-                ("git", "reset", "--hard", "HEAD"),
+                ("git", "checkout", "-f", "--recurse-submodules", "HEAD"),
                 cwd=self.stm32cube_serie_path,
             )