diff --git a/flash_profiles.json b/flash_profiles.json
index 6c84b11..cc7de72 100644
--- a/flash_profiles.json
+++ b/flash_profiles.json
@@ -10,7 +10,7 @@
     "default_target": "EIF_FPGA1",
     "verify_after_write": true,
     "max_tftp_retries": 3,
-    "max_register_retries": 500,
+    "max_register_retries": 10,
     "max_chunk_write_retries": 3
   },
   "models": {
diff --git a/pydownloadfwviasrio/gui/gui.py b/pydownloadfwviasrio/gui/gui.py
index b20b964..176aeca 100644
--- a/pydownloadfwviasrio/gui/gui.py
+++ b/pydownloadfwviasrio/gui/gui.py
@@ -772,9 +772,9 @@ class ConfigManagerDialog:
             self.manager.global_config.max_register_retries = int(self.global_register_retries_entry.get().strip())
             self.manager.global_config.max_chunk_write_retries = int(self.global_chunk_retries_entry.get().strip())
             
-            messagebox.showinfo("Success", "Global settings applied successfully")
+            messagebox.showinfo("Success", "Global settings applied successfully", parent=self.dialog)
         except ValueError as e:
-            messagebox.showerror("Error", f"Invalid input: {e}")
+            messagebox.showerror("Error", f"Invalid input: {e}", parent=self.dialog)
 
     # Models Methods
     def _refresh_models_list(self) -> None:
@@ -912,7 +912,7 @@ class ConfigManagerDialog:
             else:
                 id_model = int(self.model_id_entry.get().strip())
                 if id_model in self.manager.models:
-                    messagebox.showerror("Error", f"Model ID {id_model} already exists.")
+                    messagebox.showerror("Error", f"Model ID {id_model} already exists.", parent=self.dialog)
                     return
 
             test_addr_str = self.model_test_addr_entry.get().strip()
@@ -944,16 +944,16 @@ class ConfigManagerDialog:
                     self.models_listbox.see(idx)
                     break
             
-            messagebox.showinfo("Success", f"Model '{new_model.model}' saved successfully")
+            messagebox.showinfo("Success", f"Model '{new_model.model}' saved successfully", parent=self.dialog)
 
         except ValueError as e:
-            messagebox.showerror("Error", f"Invalid input: {e}")
+            messagebox.showerror("Error", f"Invalid input: {e}", parent=self.dialog)
 
     def _delete_model(self) -> None:
         """Delete selected model."""
         selection = self.models_listbox.curselection()
         if not selection:
-            messagebox.showwarning("No Selection", "Please select a model to delete.")
+            messagebox.showwarning("No Selection", "Please select a model to delete.", parent=self.dialog)
             return
 
         models_list = sorted(self.manager.models.items())
@@ -962,10 +962,10 @@ class ConfigManagerDialog:
         # Check if model is in use
         in_use = [t.id_target for t in self.manager.targets.values() if t.id_model == id_model]
         if in_use:
-            messagebox.showerror("Cannot Delete", f"Model is in use by targets: {', '.join(in_use)}")
+            messagebox.showerror("Cannot Delete", f"Model is in use by targets: {', '.join(in_use)}", parent=self.dialog)
             return
 
-        if messagebox.askyesno("Confirm Delete", f"Delete model '{model.model}'?"):
+        if messagebox.askyesno("Confirm Delete", f"Delete model '{model.model}'?", parent=self.dialog):
             self.manager.delete_model(id_model)
             self._refresh_models_list()
             self._show_model_editor(None)
@@ -1118,16 +1118,16 @@ class ConfigManagerDialog:
             else:
                 id_target = self.target_id_entry.get().strip()
                 if not id_target:
-                    messagebox.showerror("Error", "Target ID is required.")
+                    messagebox.showerror("Error", "Target ID is required.", parent=self.dialog)
                     return
                 if id_target in self.manager.targets:
-                    messagebox.showerror("Error", f"Target '{id_target}' already exists.")
+                    messagebox.showerror("Error", f"Target '{id_target}' already exists.", parent=self.dialog)
                     return
 
             # Extract model ID from combobox selection
             model_str = self.target_model_combo.get()
             if not model_str:
-                messagebox.showerror("Error", "Please select a model.")
+                messagebox.showerror("Error", "Please select a model.", parent=self.dialog)
                 return
             
             # Parse "[ID] ..." format
@@ -1164,22 +1164,22 @@ class ConfigManagerDialog:
             # Refresh default target combo in global tab
             self.global_default_combo['values'] = list(self.manager.targets.keys())
             
-            messagebox.showinfo("Success", f"Target '{new_target.id_target}' saved successfully")
+            messagebox.showinfo("Success", f"Target '{new_target.id_target}' saved successfully", parent=self.dialog)
 
         except ValueError as e:
-            messagebox.showerror("Error", f"Invalid input: {e}")
+            messagebox.showerror("Error", f"Invalid input: {e}", parent=self.dialog)
 
     def _delete_target(self) -> None:
         """Delete selected target."""
         selection = self.targets_listbox.curselection()
         if not selection:
-            messagebox.showwarning("No Selection", "Please select a target to delete.")
+            messagebox.showwarning("No Selection", "Please select a target to delete.", parent=self.dialog)
             return
 
         targets_list = sorted(self.manager.targets.items())
         id_target, target = targets_list[selection[0]]
 
-        if messagebox.askyesno("Confirm Delete", f"Delete target '{target.id_target}'?"):
+        if messagebox.askyesno("Confirm Delete", f"Delete target '{target.id_target}'?", parent=self.dialog):
             self.manager.delete_target(id_target)
             self._refresh_targets_list()
             self.refresh_callback()
@@ -1192,7 +1192,7 @@ class ConfigManagerDialog:
         """Save configuration and close dialog."""
         self.manager.save()
         self.refresh_callback()
-        messagebox.showinfo("Success", "Configuration saved successfully")
+        messagebox.showinfo("Success", "Configuration saved successfully", parent=self.dialog)
         self.dialog.destroy()