diff --git a/laser_tracing_config.py b/laser_tracing_config.py
index 09ee02b..0f18e83 100644
--- a/laser_tracing_config.py
+++ b/laser_tracing_config.py
@@ -344,11 +344,6 @@ class LaserTracingConfigApp:
 
     def _on_data_received(self, text):
         self._log(text, "recv", newline=False)
-        # 等待 dch ch1 切换完成后再发送 para
-        if getattr(self, "_pending_dch", False) and "Debug channel switched to RS485_1" in self.recv_buffer:
-            self._pending_dch = False
-            self._send_command("para")
-            return
         # 收到完整para回应：起始与结束各出现一次分隔符（****）后才解析
         marker = "**********************************************************"
         if self.recv_buffer.count(marker) >= 2:
@@ -375,8 +370,7 @@ class LaserTracingConfigApp:
     # ─────────────────── 指令发送 ───────────────────
 
     def _send_para(self):
-        self._pending_dch = True
-        self._send_command("dch ch1")
+        self._send_command("para")
 
     def _launch_upgrade(self):
         """打开设备升级对话框。复用当前已连接的串口，不断开连接。"""
diff --git a/通用升级程序.exe b/通用升级程序.exe
deleted file mode 100644
index 804aedc..0000000
Binary files a/通用升级程序.exe and /dev/null differ