diff --git a/gateway_config.py b/gateway_config.py
index 75d350e..9171777 100644
--- a/gateway_config.py
+++ b/gateway_config.py
@@ -294,8 +294,33 @@ class TcpServerThread(QThread):
 
     def stop(self):
         self.running = False
+        try:
+            if self.sock:
+                self.sock.close()   # 打断accept轮询, run循环立即退出
+        except Exception:
+            pass
+        self._close_all_clients()
         self.wait(3000)
 
+    def _close_all_clients(self):
+        """主动断开所有已连接客户端(网关模组的TCP链路随之释放, 对端能立刻感知断开)。"""
+        with self.conn_lock:
+            conns = list(self._conns.keys())
+            self._conns.clear()
+            self.conn = None
+            self.target_ip = None
+        for conn in conns:
+            try:
+                conn.shutdown(socket.SHUT_RDWR)
+            except Exception:
+                pass
+            try:
+                conn.close()
+            except Exception:
+                pass
+        self._hexbufs.clear()
+        self._push_ip_list()
+
 
 class GatewayConfigTool(QMainWindow):
     def __init__(self):
@@ -315,7 +340,7 @@ class GatewayConfigTool(QMainWindow):
         self.refresh_ports()
 
     def init_ui(self):
-        self.setWindowTitle("网关配置工具(宽带版 V1.3.0)")
+        self.setWindowTitle("网关配置工具(宽带版 V1.3.1)")
         self.setWindowIcon(QIcon(resource_path("物联网网关.png")))
         self.setMinimumSize(940, 640)
         self.resize(1000, 700)
@@ -795,6 +820,8 @@ class UpgradeDialog(QDialog):
         self._timer = QTimer()
         self.channel = 'serial'       # 升级通道: serial / tcp
         self.tcp_thread = None
+        self.ser = None               # 升级通道串口对象(独立于主界面串口)
+        self._serial_rx = None        # 升级串口接收线程
         self._window = 8              # TCP模式每批包数(窗口流控)
         self._window_start = 0        # 当前批次首包序号(超时重发用)
         self._retry_cnt = 0           # TCP模式超时重发计数
@@ -832,7 +859,7 @@ class UpgradeDialog(QDialog):
         # 通道选择 + TCP监听
         cfg_layout.addWidget(QLabel("通道:"), 2, 0)
         self.combo_channel = QComboBox()
-        self.combo_channel.addItems(["串口", "TCP(Cat1)"])
+        self.combo_channel.addItems(["串口", "TCP(Cat1)", "TCP(ETH)"])
         self.combo_channel.currentIndexChanged.connect(self._on_channel_changed)
         cfg_layout.addWidget(self.combo_channel, 2, 1)
         tcp_row = QHBoxLayout()
@@ -1263,6 +1290,7 @@ class UpgradeDialog(QDialog):
         done = max(self._sent) + 1
         self.progress.setValue(min(int(done * 100.0 / self._pkg_num), 100))
         self.status_lbl.setText(f"{done}/{self._pkg_num} 包")
+        self._timer.start(3000)   # 批次发完重置超时: 防止上次定时器虚假触发(REQ已处理仍判超时)
         if len(self._sent) >= self._pkg_num:
             self._finish()
 
@@ -1309,8 +1337,25 @@ class UpgradeDialog(QDialog):
             self._cancel_upgrade()
         else:
             self._release_session()
-        if self.ser and self.ser.is_open:
-            self._toggle_serial()
+        # 升级TCP通道: 停止监听并主动断开已连接的客户端, 释放网关模组建立的TCP链路
+        if self.tcp_thread is not None:
+            if self.tcp_thread.isRunning():
+                self.tcp_thread.stop()
+            self.tcp_thread = None
+            self.btn_tcp_listen.setText("开始监听")
+        # 串口通道: 关闭升级页面打开的串口
+        if self.ser is not None:
+            if self._serial_rx is not None:
+                self._serial_rx.stop()
+                self._serial_rx = None
+            try:
+                self.ser.close()
+            except Exception:
+                pass
+            self.ser = None
+            self.btn_serial_open.setText("打开串口")
+            self.serial_status_lbl.setText("未打开")
+            self.serial_status_lbl.setStyleSheet("color:#909090;")
         self._reset_ui()
         event.accept()