diff --git a/cx_setup.py b/cx_setup.py
index de85be7..db0c7a7 100644
--- a/cx_setup.py
+++ b/cx_setup.py
@@ -45,4 +45,3 @@ setup(
         },
     },
 )
-
diff --git a/meshchatx/meshchat.py b/meshchatx/meshchat.py
index f7b8a0d..da94539 100644
--- a/meshchatx/meshchat.py
+++ b/meshchatx/meshchat.py
@@ -1116,7 +1116,11 @@ class ReticulumMeshChat:
                 interfaces[interface_name] = interface_details
 
             # handle SerialInterface, KISSInterface, and AX25KISSInterface
-            if interface_type in ("SerialInterface", "KISSInterface", "AX25KISSInterface"):
+            if interface_type in (
+                "SerialInterface",
+                "KISSInterface",
+                "AX25KISSInterface",
+            ):
                 # ensure port provided
                 interface_port = data.get("port")
                 if interface_port is None or interface_port == "":
@@ -5051,8 +5055,8 @@ class NomadnetDownloader:
         self.path = path
         self.data = data
         self.timeout = timeout
-        self.on_download_success = on_download_success
-        self.on_download_failure = on_download_failure
+        self._download_success_callback = on_download_success
+        self._download_failure_callback = on_download_failure
         self.on_progress_update = on_progress_update
         self.request_receipt = None
         self.is_cancelled = False
@@ -5077,7 +5081,7 @@ class NomadnetDownloader:
                 pass
 
         # notify that download was cancelled
-        self.on_download_failure("cancelled")
+        self._download_failure_callback("cancelled")
 
     # setup link to destination and request download
     async def download(
@@ -5117,7 +5121,7 @@ class NomadnetDownloader:
 
         # if we still don't have a path, we can't establish a link, so bail out
         if not RNS.Transport.has_path(self.destination_hash):
-            self.on_download_failure("Could not find path to destination.")
+            self._download_failure_callback("Could not find path to destination.")
             return
 
         # check if cancelled before establishing link
@@ -5153,7 +5157,7 @@ class NomadnetDownloader:
 
         # if we still haven't established a link, bail out
         if link.status is not RNS.Link.ACTIVE:
-            self.on_download_failure("Could not establish link to destination.")
+            self._download_failure_callback("Could not establish link to destination.")
 
     # link to destination was established, we should now request the download
     def link_established(self, link):
@@ -5176,11 +5180,11 @@ class NomadnetDownloader:
 
     # handle successful download
     def on_response(self, request_receipt: RNS.RequestReceipt):
-        self.on_download_success(request_receipt)
+        self._download_success_callback(request_receipt)
 
     # handle failure
     def on_failed(self, request_receipt=None):
-        self.on_download_failure("request_failed")
+        self._download_failure_callback("request_failed")
 
     # handle download progress
     def on_progress(self, request_receipt):
diff --git a/meshchatx/src/version.py b/meshchatx/src/version.py
index b63d68e..300e9ad 100644
--- a/meshchatx/src/version.py
+++ b/meshchatx/src/version.py
@@ -1,6 +1,5 @@
-"""
-Auto-generated helper so Python tooling and the Electron build
+"""Auto-generated helper so Python tooling and the Electron build
 share the same version string.
 """
 
-__version__ = '2.41.0'
+__version__ = "2.41.0"
diff --git a/scripts/prepare_frontend_dir.py b/scripts/prepare_frontend_dir.py
index 881c5e1..4cb3cd1 100644
--- a/scripts/prepare_frontend_dir.py
+++ b/scripts/prepare_frontend_dir.py
@@ -1,5 +1,5 @@
-from pathlib import Path
 import shutil
+from pathlib import Path
 
 TARGET = Path("meshchatx") / "public"
 
@@ -12,4 +12,3 @@ if TARGET.exists():
     shutil.rmtree(TARGET)
 
 TARGET.mkdir(parents=True, exist_ok=True)
-