diff --git a/lib/common/utils/app/app_setting_tool.dart b/lib/common/utils/app/app_setting_tool.dart
index 872bdb6..307b08c 100644
--- a/lib/common/utils/app/app_setting_tool.dart
+++ b/lib/common/utils/app/app_setting_tool.dart
@@ -768,8 +768,9 @@ abstract class AppSettingTool {
     }
   }
 
-  // 根据后台返回的数据更新到缓存
-  static Future<void> updateSysInfoByService(ServiceHardware data) async {
+  // 根据后台返回的数据更新到缓存；返回排除 syncTime 后业务字段是否有变化，
+  // 供定时任务决定是否广播配置刷新，避免无变化时反复弹"配置修改中"遮罩。
+  static Future<bool> updateSysInfoByService(ServiceHardware data) async {
     if (ObjectUtil.isEmpty(data)) {
       final setting = SysSetting(
         sysType: SysType.CANTEEN,
@@ -777,9 +778,13 @@ abstract class AppSettingTool {
         sqlAddress: await AppFileTool.getDatabaseBackupPath(),
       );
       await _setSetting(sysJson: setting);
-      return;
+      return true;
     }
     final sysSetting = await AppSettingTool.getSysSetting();
+    // syncTime 每次同步都会刷新，判定业务变化前先排除该键。
+    final beforeJson = json.encode(
+      sysSetting.toJson()..remove('syncTime'),
+    );
     final id = data.id;
     if (ObjectUtil.isNotEmpty(id)) {
       sysSetting.serviceId = id;
@@ -849,6 +854,10 @@ abstract class AppSettingTool {
     }
     sysSetting.syncTime = DateTime.now();
     await _setSetting(sysJson: sysSetting);
+    final afterJson = json.encode(
+      sysSetting.toJson()..remove('syncTime'),
+    );
+    return beforeJson != afterJson;
   }
 
   /// 将当前业务终端的打印机绑定和打印参数持久化到本机；空响应表示尚未绑定。
diff --git a/lib/common/utils/sync/sync_check_tool.dart b/lib/common/utils/sync/sync_check_tool.dart
index d087e78..ec34db6 100644
--- a/lib/common/utils/sync/sync_check_tool.dart
+++ b/lib/common/utils/sync/sync_check_tool.dart
@@ -817,7 +817,14 @@ class SyncCheckTool {
             ? _ScheduledTaskActionResult.skipped(update.message)
             : _ScheduledTaskActionResult.success(update.message);
       case ScheduledTaskType.configSync:
-        await SyncConfigTool.autoSyncSysInfo();
+        final result = await SyncConfigTool.autoSyncSysInfo();
+        // 配置变化才广播刷新：面板页收到 CONFIG 会弹"配置修改中"遮罩，
+        // 无条件广播会让收银页随定时周期反复被遮罩打断。
+        if (result != null &&
+            result.changed &&
+            Get.isRegistered<AppControl>()) {
+          Get.find<AppControl>().mqUpdateEventBus.fire(MqtActionEnum.CONFIG);
+        }
         return const _ScheduledTaskActionResult.success('设备配置同步完成');
       case ScheduledTaskType.departmentFaceSync:
         final mode = request.debugAllFaces
diff --git a/lib/common/utils/sync/sync_config_tool.dart b/lib/common/utils/sync/sync_config_tool.dart
index 0c5e32f..6b299c1 100644
--- a/lib/common/utils/sync/sync_config_tool.dart
+++ b/lib/common/utils/sync/sync_config_tool.dart
@@ -4,11 +4,16 @@ import 'package:common_utils/common_utils.dart';
 
 import 'package:pj_supermarket_cloud/common/index.dart';
 
+/// 设备配置同步结果：setting 为已落库的最新快照，changed 表示业务字段是否有变化。
+typedef SysConfigSyncResult = ({SysSetting setting, bool changed});
+
 abstract class SyncConfigTool {
   static const _tag = "sync配置工具";
 
-  // 自动同步设备信息导本地缓存
-  static Future<SysSetting?> autoSyncSysInfo() async {
+  /// 自动同步设备信息到本地缓存；未登录、未绑定或接口失败返回 null。
+  /// 返回的必须是同步后的最新快照：调用方会直接用它刷新界面（如基本信息页），
+  /// 返回同步前的旧实例会让页面继续显示旧端口等配置。
+  static Future<SysConfigSyncResult?> autoSyncSysInfo() async {
     final login = await AppUserTool.isLogin();
     if (!login) return null;
     final sysSetting = await AppSettingTool.getSysSetting();
@@ -23,37 +28,32 @@ abstract class SyncConfigTool {
       return null;
     }
     // 基本信息
-    await AppSettingTool.updateSysInfoByService(data);
+    final changed = await AppSettingTool.updateSysInfoByService(data);
     // 人脸sdk
-    await autoSyncFaceSdk(detail: data, sysInfo: sysSetting);
-    logger.i("|$_tag|结束同步设备信息 sysInfo:|${json.encode(sysSetting)}|");
-    return sysSetting;
+    final latest = await AppSettingTool.getSysSetting();
+    await autoSyncFaceSdk(
+      detail: data,
+      before: sysSetting,
+      latest: latest,
+    );
+    logger.i("|$_tag|结束同步设备信息 sysInfo:|${json.encode(latest)}|");
+    return (setting: latest, changed: changed);
   }
 
-  // 自动同步设备信息导本地缓存-同步人脸sdk
+  /// 同步后检查人脸 SDK 参数并记录激活状态；回写必须用最新快照 latest。
+  /// before 仅用于判定服务端是否变更了人脸参数；若用同步前的旧实例整体回写，
+  /// 会把 updateSysInfoByService 刚写入的新 MQTT 配置回滚成旧值。
   static Future<void> autoSyncFaceSdk({
     required ServiceHardware detail,
-    required SysSetting sysInfo,
+    required SysSetting before,
+    required SysSetting latest,
   }) async {
-    final appId = detail.faceAppId;
-    final sdkKey = detail.faceSdkKey;
-    final activeKey = detail.faceActiveKey;
-    bool isUpdate = false;
-    if (appId != sysInfo.faceAppId) {
-      sysInfo.faceAppId = appId;
-      isUpdate = true;
-    }
-    if (sdkKey != sysInfo.faceSdkKey) {
-      sysInfo.faceSdkKey = sdkKey;
-      isUpdate = true;
-    }
-    if (activeKey != sysInfo.faceActiveKey) {
-      sysInfo.faceActiveKey = activeKey;
-      isUpdate = true;
-    }
-    if (!isUpdate) return;
+    final changed = detail.faceAppId != before.faceAppId ||
+        detail.faceSdkKey != before.faceSdkKey ||
+        detail.faceActiveKey != before.faceActiveKey;
+    if (!changed) return;
     final activeSdk = await AppFaceTool.isActiveSdk();
-    await AppSettingTool.setSysSetting(sysInfo);
+    await AppSettingTool.setSysSetting(latest);
     logger.i("|$_tag||同步人脸sdk参数自动激活${activeSdk ? '成功' : '失败'}");
   }
 }
diff --git a/lib/pages/setting/controller.dart b/lib/pages/setting/controller.dart
index 6806597..37211a2 100644
--- a/lib/pages/setting/controller.dart
+++ b/lib/pages/setting/controller.dart
@@ -312,8 +312,11 @@ class SettingController extends GetxController {
       maskType: EasyLoadingMaskType.black,
     );
     try {
-      final setting = await SyncConfigTool.autoSyncSysInfo();
-      if (setting != null) sysSetting.value = setting;
+      final result = await SyncConfigTool.autoSyncSysInfo();
+      // result.setting 是同步后最新快照，直接刷新 Rx 才能让基本信息页显示新配置。
+      if (result != null) {
+        sysSetting.value = _orderedSysSetting(result.setting);
+      }
       Toast.success(msg: "同步设备信息成功");
       EasyLoading.dismiss();
     } catch (e, stack) {
diff --git a/lib/pages/setting/face_setting_controller.dart b/lib/pages/setting/face_setting_controller.dart
index 24a19ad..9ee6d82 100644
--- a/lib/pages/setting/face_setting_controller.dart
+++ b/lib/pages/setting/face_setting_controller.dart
@@ -162,8 +162,8 @@ class FaceSettingController extends GetxController {
     isSyncingConfig.value = true;
     errorMessage.value = '';
     try {
-      final setting = await SyncConfigTool.autoSyncSysInfo();
-      if (setting == null) {
+      final result = await SyncConfigTool.autoSyncSysInfo();
+      if (result == null) {
         throw Exception('设备配置同步无返回');
       }
       await Get.find<SettingController>().getSetting();