diff --git a/app_dashboard/changelog.md b/app_dashboard/changelog.md
index 338b466..8b931e4 100644
--- a/app_dashboard/changelog.md
+++ b/app_dashboard/changelog.md
@@ -9,6 +9,16 @@ author:
 2. $ {VERSION_CODE} (去掉空格)，会自动替换实际修订号，比如 1.1.4.$ {VERSION_CODE}
 -->
 
+### [1.0.5.${VERSION_CODE}] - 2026.3.5
+
+#### 文件下载
+
+* [dashboardclient_1.0.5.apk](dashboardclient_1.0.5.apk)
+
+#### 更新记录
+* 仅串口路径为空时才自动检测设备
+* 设置界面可清除串口路径
+
 ### [1.0.4.23] - 2026.1.5
 
 #### 文件下载
diff --git a/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/BuildingDashboardActivity.java b/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/BuildingDashboardActivity.java
index ba04038..98d0a38 100644
--- a/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/BuildingDashboardActivity.java
+++ b/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/BuildingDashboardActivity.java
@@ -110,22 +110,29 @@ public class BuildingDashboardActivity extends FullscreenActivity {
         configUrl = urlPrefix + "/data/config.json";
         mainUrl = urlEndPoint.isEmpty() ? urlPrefix : urlPrefix + "/" + urlEndPoint;
 
+        Log.i(TAG, "Main: " + mainUrl);
+        Log.i(TAG, "Config: " + configUrl);
+
         configLoadHandler.post(configLoadRunnable);
         loadUrlWithRetry();
     }
 
     private void initSerialPort() {
         String portPath = PreferenceConfiguration.getSerialPortPath(this);
-        int baudRate = PreferenceConfiguration.getSerialPortBaudRate(this);
 
-        // 初始化串口检测器
-        detector = new SerialPortDetector(portPath, baudRate);
+        // 只有 portPath 为空时才进行串口检测
+        if (TextUtils.isEmpty(portPath)) {
+            int baudRate = PreferenceConfiguration.getSerialPortBaudRate(this);
+            // 初始化串口检测器
+            detector = new SerialPortDetector(portPath, baudRate);
 
-        // 每次启动都进行串口检测/验证
-        // 参数 true 表示确保设备开机（发送两个命令）
-        // 参数 false 表示仅检测串口（任一命令有响应即可）
-        Log.i(TAG, "Starting serial port detection/verification...");
-        startSerialPortDetection(true);
+            Log.i(TAG, "Starting serial port detection/verification...");
+            // 参数 true 表示确保设备开机（发送两个命令）
+            // 参数 false 表示仅检测串口（任一命令有响应即可）
+            startSerialPortDetection(true);
+        } else {
+            Log.i(TAG, "Using saved serial port path: " + portPath);
+        }
     }
 
     /**
@@ -276,6 +283,8 @@ public class BuildingDashboardActivity extends FullscreenActivity {
         WebSettings webSettings = binding.webview.getSettings();
         webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
         webSettings.setJavaScriptEnabled(true);
+        // 允许媒体自动播放 (Android 8+ 必须)
+        webSettings.setMediaPlaybackRequiresUserGesture(false);
 
         // 禁用缩放相关设置
         webSettings.setTextZoom(100);
diff --git a/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/SettingsActivity.java b/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/SettingsActivity.java
index f5d3726..85c5e26 100644
--- a/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/SettingsActivity.java
+++ b/app_dashboard/src/main/java/cn/ykbox/dashboard/activity/SettingsActivity.java
@@ -1,12 +1,16 @@
 package cn.ykbox.dashboard.activity;
 
+import android.content.SharedPreferences;
 import android.os.Bundle;
 
 import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 
 import cn.ykbox.dashboard.R;
+import cn.ykbox.dashboard.perferences.PreferenceConfiguration;
 
 public class SettingsActivity extends AppCompatActivity {
 
@@ -30,6 +34,21 @@ public class SettingsActivity extends AppCompatActivity {
         @Override
         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
             setPreferencesFromResource(R.xml.root_preferences, rootKey);
+
+            Preference clearDevicePref = findPreference("k_clear_device");
+            if (clearDevicePref != null) {
+                clearDevicePref.setOnPreferenceClickListener(preference -> {
+                    new AlertDialog.Builder(requireContext())
+                            .setTitle("确认清除")
+                            .setMessage("确定要清除当前串口设备路径吗？")
+                            .setPositiveButton("确定", (dialog, which) -> {
+                                PreferenceConfiguration.setSerialPortPath(requireContext(), "");
+                            })
+                            .setNegativeButton("取消", null)
+                            .show();
+                    return true;
+                });
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/app_dashboard/src/main/res/xml/root_preferences.xml b/app_dashboard/src/main/res/xml/root_preferences.xml
index 4898572..8aa2dd4 100644
--- a/app_dashboard/src/main/res/xml/root_preferences.xml
+++ b/app_dashboard/src/main/res/xml/root_preferences.xml
@@ -25,5 +25,9 @@
             app:title="串口波特率"
             app:defaultValue="9600"
             app:useSimpleSummaryProvider="true" />
+        <Preference
+            app:key="k_clear_device"
+            app:title="清除设备"
+            app:summary="清除当前串口设备路径, 下次启动时自动检测设备。" />
     </PreferenceCategory>
 </PreferenceScreen>
\ No newline at end of file