diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/dto/V2rayConfig.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/dto/V2rayConfig.kt
index aa3fd0c7..bcb23a5c 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/dto/V2rayConfig.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/dto/V2rayConfig.kt
@@ -68,8 +68,6 @@ data class V2rayConfig(
     ) {
         data class OutSettingsBean(
             var vnext: List<VnextBean>? = null,
-            var fragment: FragmentBean? = null,
-            var noises: List<NoiseBean>? = null,
             var servers: List<ServersBean>? = null,
             /*Blackhole*/
             var response: Response? = null,
@@ -108,18 +106,6 @@ data class V2rayConfig(
                 )
             }
 
-            data class FragmentBean(
-                var packets: String? = null,
-                var length: String? = null,
-                var interval: String? = null
-            )
-
-            data class NoiseBean(
-                var type: String? = null,
-                var packet: String? = null,
-                var delay: String? = null
-            )
-
             data class ServersBean(
                 var address: String = "",
                 var method: String? = null,
@@ -306,9 +292,25 @@ data class V2rayConfig(
                     var settings: MaskSettingsBean? = null
                 ) {
                     data class MaskSettingsBean(
-                        var password: String? = null,
-                        var domain: String? = null
-                    )
+                        val password: String? = null,
+                        val domain: String? = null,
+                        // fragment
+                        val packets: String? = null,
+                        val length: String? = null,
+                        val delay: String? = null,
+                        // val maxSplit: String? = null,
+                        // noise
+                        val reset: Int? = null,
+                        val noise: List<NoiseMaskBean>? = null
+                    ) {
+                        data class NoiseMaskBean(
+                            val rand: String? = null,
+                            // val randRange: String? = null,
+                            // val type: String? = null,
+                            // val packet: String? = null,
+                            val delay: String? = null,
+                        )
+                    }
                 }
                 data class QuicParamsBean(
                     var congestion: String? = null,
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt
index 1d93687e..97426893 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt
@@ -710,8 +710,6 @@ object V2rayConfigManager {
         } else {
             v2rayConfig.outbounds.add(outbound)
         }
-
-        updateOutboundFragment(v2rayConfig)
         return true
     }
 
@@ -955,68 +953,80 @@ object V2rayConfigManager {
      *
      * Configures packet fragmentation for TLS and REALITY protocols if enabled.
      *
-     * @param v2rayConfig The V2ray configuration object to be modified
+     * @param streamSettings The streamSettings object to be modified
      * @return true if fragment configuration was successful, false otherwise
      */
-    private fun updateOutboundFragment(v2rayConfig: V2rayConfig): Boolean {
+    private fun updateOutboundFragment(streamSettings: StreamSettingsBean): Boolean {
         try {
             if (MmkvManager.decodeSettingsBool(AppConfig.PREF_FRAGMENT_ENABLED, false) == false) {
                 return true
             }
-            if (v2rayConfig.outbounds[0].streamSettings?.security != AppConfig.TLS
-                && v2rayConfig.outbounds[0].streamSettings?.security != AppConfig.REALITY
+            if (streamSettings.security != AppConfig.TLS
+                && streamSettings.security != AppConfig.REALITY
             ) {
                 return true
             }
-
-            val fragmentOutbound =
-                OutboundBean(
-                    protocol = AppConfig.PROTOCOL_FREEDOM,
-                    tag = AppConfig.TAG_FRAGMENT,
-                    mux = null
-                )
+            if (streamSettings.sockopt?.dialerProxy.isNotNullEmpty()) {
+                return true
+            }
 
             var packets =
                 MmkvManager.decodeSettingsString(AppConfig.PREF_FRAGMENT_PACKETS) ?: "tlshello"
-            if (v2rayConfig.outbounds[0].streamSettings?.security == AppConfig.REALITY
+            if (streamSettings.security == AppConfig.REALITY
                 && packets == "tlshello"
             ) {
                 packets = "1-3"
-            } else if (v2rayConfig.outbounds[0].streamSettings?.security == AppConfig.TLS
+            } else if (streamSettings.security == AppConfig.TLS
                 && packets != "tlshello"
             ) {
                 packets = "tlshello"
             }
 
-            fragmentOutbound.settings = OutSettingsBean(
-                fragment = OutSettingsBean.FragmentBean(
+            val fragmentMask = StreamSettingsBean.FinalMaskBean.MaskBean(
+                type = "fragment",
+                settings = StreamSettingsBean.FinalMaskBean.MaskBean.MaskSettingsBean(
                     packets = packets,
                     length = MmkvManager.decodeSettingsString(AppConfig.PREF_FRAGMENT_LENGTH)
                         ?: "50-100",
-                    interval = MmkvManager.decodeSettingsString(AppConfig.PREF_FRAGMENT_INTERVAL)
+                    delay = MmkvManager.decodeSettingsString(AppConfig.PREF_FRAGMENT_INTERVAL)
                         ?: "10-20"
-                ),
-                noises = listOf(
-                    OutSettingsBean.NoiseBean(
-                        type = "rand",
-                        packet = "10-20",
-                        delay = "10-16",
+                )
+            )
+            val noiseMask = StreamSettingsBean.FinalMaskBean.MaskBean(
+                type = "noise",
+                settings = StreamSettingsBean.FinalMaskBean.MaskBean.MaskSettingsBean(
+                    noise = listOf(
+                        StreamSettingsBean.FinalMaskBean.MaskBean.MaskSettingsBean.NoiseMaskBean(
+                            rand = "10-20",
+                            delay = "10-16",
+                        )
                     )
-                ),
-            )
-            fragmentOutbound.streamSettings = StreamSettingsBean(
-                sockopt = StreamSettingsBean.SockoptBean(
-                    TcpNoDelay = true,
-                    mark = 255
                 )
             )
-            v2rayConfig.outbounds.add(fragmentOutbound)
 
-            //proxy chain
-            v2rayConfig.outbounds[0].streamSettings?.sockopt =
-                StreamSettingsBean.SockoptBean(
-                    dialerProxy = AppConfig.TAG_FRAGMENT
-                )
+            val finalMaskObj = streamSettings.finalmask?.let { existingFinalMask ->
+                JsonUtil.parseString(JsonUtil.toJson(existingFinalMask))
+            } ?: com.google.gson.JsonObject()
+
+            // finalmask.tcp / finalmask.udp are arrays; prepend mask at index 0.
+            fun prependMask(scope: String, mask: StreamSettingsBean.FinalMaskBean.MaskBean) {
+                val current = finalMaskObj.get(scope)
+                if (current != null && current.isJsonArray && current.asJsonArray.size() > 0) {
+                    return
+                }
+
+                val newArray = JsonArray()
+                newArray.add(JsonUtil.parseString(JsonUtil.toJson(mask)))
+
+                if (current != null && current.isJsonArray) {
+                    current.asJsonArray.forEach { newArray.add(it) }
+                }
+                finalMaskObj.add(scope, newArray)
+            }
+
+            prependMask("tcp", fragmentMask)
+            prependMask("udp", noiseMask)
+            streamSettings.finalmask = finalMaskObj
         } catch (e: Exception) {
             Log.e(AppConfig.TAG, "Failed to update outbound fragment", e)
             return false
@@ -1402,6 +1412,10 @@ object V2rayConfigManager {
             streamSettings.tlsSettings = null
             streamSettings.realitySettings = tlsSetting
         }
+
+        if (profileItem.finalMask.isNullOrEmpty()) {
+            updateOutboundFragment(streamSettings)
+        }
     }
 
     //endregion