diff --git a/lib/features/config_option/overview/config_options_page.dart b/lib/features/config_option/overview/config_options_page.dart
index bab3d373..37154714 100644
--- a/lib/features/config_option/overview/config_options_page.dart
+++ b/lib/features/config_option/overview/config_options_page.dart
@@ -358,13 +358,14 @@ class ConfigOptionsPage extends HookConsumerWidget {
                     digitsOnly: true,
                     inputToValue: int.tryParse,
                   ),
-                  const Gap(24),
+                  
                   SwitchListTile(
                     title: Text(experimental(t.config.useXrayCoreWhenPossible.Label)),
                     subtitle: Text(t.config.useXrayCoreWhenPossible.Description),
                     value: ref.watch(ConfigOptions.useXrayCoreWhenPossible),
                     onChanged: ref.watch(ConfigOptions.useXrayCoreWhenPossible.notifier).update,
                   ),
+                  const Gap(24),
                 ],
               ),
             ),
diff --git a/lib/features/profile/data/profile_repository.dart b/lib/features/profile/data/profile_repository.dart
index e6537017..af6816e0 100644
--- a/lib/features/profile/data/profile_repository.dart
+++ b/lib/features/profile/data/profile_repository.dart
@@ -177,7 +177,9 @@ class ProfileRepositoryImpl with ExceptionHandler, InfraLogger implements Profil
     bool debug,
   ) {
     return exceptionHandler(
-      () {
+      () async {
+        singbox.changeOptions(await configOptionRepository.getConfigOptions()).run();
+
         return singbox.validateConfigByPath(path, tempPath, debug).mapLeft(ProfileFailure.invalidConfig).run();
       },
       ProfileUnexpectedFailure.new,
@@ -276,7 +278,7 @@ class ProfileRepositoryImpl with ExceptionHandler, InfraLogger implements Profil
     return TaskEither<ProfileFailure, String>.Do(
       ($) async {
         final configFile = profilePathResolver.file(id);
-        // TODO pass options
+
         final options = await configOptionRepository.getConfigOptions();
 
         singbox.changeOptions(options).mapLeft(InvalidConfigOption.new).run();
@@ -394,10 +396,13 @@ class ProfileRepositoryImpl with ExceptionHandler, InfraLogger implements Profil
         final tempFile = profilePathResolver.tempFile(fileName);
 
         try {
+          final configs = await configOptionRepository.getConfigOptions();
+
           final response = await httpClient.download(
             url.trim(),
             tempFile.path,
             cancelToken: cancelToken,
+            userAgent: configs.useXrayCoreWhenPossible ? "v2rayNG/1.8.23" : null,
           );
           final headers = await _populateHeaders(response.headers.map, tempFile.path);
           return await validateConfig(file.path, tempFile.path, false)
diff --git a/libcore b/libcore
index b389963a..3874832c 160000
--- a/libcore
+++ b/libcore
@@ -1 +1 @@
-Subproject commit b389963aa8a5a83e512b3ead9a84c2f1702f7cf8
+Subproject commit 3874832ccf0bf312f9310829a2b4043febf17f27