diff --git a/main.py b/main.py
index 1128d79..dac96ae 100644
--- a/main.py
+++ b/main.py
@@ -826,10 +826,32 @@ class App(QWidget):
         self.flash_thread.device_done.connect(self._on_flash_done)
         self.flash_thread.all_done.connect(self._on_flash_all_done)
 
-        # Disable flash button trong khi đang flash
+        # Disable flash button và lock UI trong khi đang flash
         self.btn_flash.setEnabled(False)
+        self._set_main_ui_locked(True)
         self.flash_thread.start()
 
+    def _set_main_ui_locked(self, locked):
+        """Khóa toàn bộ UI nhưng vẫn cho cuộn dọc bảng thiết bị."""
+        enabled = not locked
+        self.btn_scan.setEnabled(enabled)
+        self.net_input.setEnabled(enabled)
+        self.mode_combo.setEnabled(enabled)
+        self.method_combo.setEnabled(enabled)
+        self.parallel_spin.setEnabled(enabled)
+        self.show_all_cb.setEnabled(enabled)
+        
+        # Bảng thiết bị: không setEnabled(False) để giữ thanh cuộn
+        if locked:
+            self.table.setSelectionMode(QTableWidget.SelectionMode.NoSelection)
+            self.table.setStyleSheet(
+                "QTableWidget { color: #6b7280; font-size: 13px; }"
+                "QTableWidget::item { selection-background-color: transparent; }"
+            )
+        else:
+            self.table.setSelectionMode(QTableWidget.SelectionMode.ExtendedSelection)
+            self.table.setStyleSheet("QTableWidget { font-size: 13px; }")
+
     def _on_flash_status(self, index, msg):
         """Update status column while flashing."""
         row = self._flash_row_map.get(index, index)
@@ -866,6 +888,7 @@ class App(QWidget):
     def _on_flash_all_done(self):
         """All flashing complete."""
         self.btn_flash.setEnabled(True)
+        self._set_main_ui_locked(False)
         QMessageBox.information(self, "Flash Complete", "All devices have been processed.")
 
     def _open_auto_flash(self):
@@ -1305,11 +1328,7 @@ class App(QWidget):
 
         self.auto_btn_start.setEnabled(False)
         self.auto_btn_stop.setEnabled(True)
-        self.auto_net_input.setEnabled(False)
-        self.auto_target_spin.setEnabled(False)
-        self.auto_method_combo.setEnabled(False)
-        self.auto_parallel_spin.setEnabled(False)
-        self.btn_back.setEnabled(False)
+        self._set_auto_ui_locked(True)
 
         self.auto_status_label.setText("🔍  Scanning LAN...")
         self.auto_status_label.setStyleSheet("font-size: 12px; font-weight: bold; color: #f9e2af;")
@@ -1439,13 +1458,28 @@ class App(QWidget):
     def _auto_reset_controls(self):
         self.auto_btn_start.setEnabled(True)
         self.auto_btn_stop.setEnabled(False)
-        self.auto_net_input.setEnabled(True)
-        self.auto_target_spin.setEnabled(True)
-        self.auto_method_combo.setEnabled(True)
-        self.auto_parallel_spin.setEnabled(True)
-        self.btn_back.setEnabled(True)
+        self._set_auto_ui_locked(False)
         self._auto_worker = None
 
+    def _set_auto_ui_locked(self, locked):
+        """Khóa cấu hình Auto Flash nhưng vẫn cho cuộn xem list thiết bị."""
+        enabled = not locked
+        self.auto_net_input.setEnabled(enabled)
+        self.auto_target_spin.setEnabled(enabled)
+        self.auto_method_combo.setEnabled(enabled)
+        self.auto_parallel_spin.setEnabled(enabled)
+        self.btn_back.setEnabled(enabled)
+        
+        # Bảng thiết bị Auto: không setEnabled(False) để giữ thanh cuộn
+        if locked:
+            self.auto_result_table.setSelectionMode(QTableWidget.SelectionMode.NoSelection)
+            self.auto_result_table.setStyleSheet(
+                "QTableWidget { color: #6b7280; font-size: 12px; }"
+                "QTableWidget::item { selection-background-color: transparent; }"
+            )
+        else:
+            self.auto_result_table.setSelectionMode(QTableWidget.SelectionMode.ExtendedSelection)
+            self.auto_result_table.setStyleSheet("QTableWidget { font-size: 12px; }")
 
 if __name__ == "__main__":
     app = QApplication(sys.argv)