diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/AppConfig.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/AppConfig.kt
index af13115d..8bec1f33 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/AppConfig.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/AppConfig.kt
@@ -65,7 +65,7 @@ object AppConfig {
     const val CACHE_KEYWORD_FILTER = "cache_keyword_filter"
 
     /** Protocol identifiers. */
-    const val PROTOCOL_FREEDOM: String = "freedom"
+    const val PROTOCOL_FREEDOM = "freedom"
 
     /** Broadcast actions. */
     const val BROADCAST_ACTION_SERVICE = "com.v2ray.ang.action.service"
@@ -90,16 +90,19 @@ object AppConfig {
     const val DOWNLINK = "downlink"
 
     /** URLs for various resources. */
-    const val androidpackagenamelistUrl = "https://raw.githubusercontent.com/2dust/androidpackagenamelist/master/proxy.txt"
-    const val v2rayNGUrl = "https://github.com/2dust/v2rayNG"
-    const val v2rayNGAPIUrl = "https://api.github.com/repos/2dust/v2rayNG/releases"
-    const val v2rayNGIssues = "$v2rayNGUrl/issues"
-    const val v2rayNGWikiMode = "$v2rayNGUrl/wiki/Mode"
-    const val v2rayNGPrivacyPolicy = "https://raw.githubusercontent.com/2dust/v2rayNG/master/CR.md"
-    const val PromotionUrl = "aHR0cHM6Ly85LjIzNDQ1Ni54eXovYWJjLmh0bWw="
-    const val TgChannelUrl = "https://t.me/github_2dust"
-    const val DelayTestUrl = "https://www.gstatic.com/generate_204"
-    const val DelayTestUrl2 = "https://www.google.com/generate_204"
+    const val GITHUB_URL = "https://github.com"
+    const val GITHUB_RAW_URL = "https://raw.githubusercontent.com"
+    const val GITHUB_DOWNLOAD = "releases/latest/download"
+    const val ANDROID_PACKAGE_NAME_LIST_URL = "$GITHUB_RAW_URL/2dust/androidpackagenamelist/master/proxy.txt"
+    const val APP_URL = "$GITHUB_URL/2dust/v2rayNG"
+    const val APP_API_URL = "https://api.github.com/repos/2dust/v2rayNG/releases"
+    const val APP_ISSUES_URL = "$APP_URL/issues"
+    const val APP_WIKI_MODE = "$APP_URL/wiki/Mode"
+    const val APP_PRIVACY_POLICY = "$GITHUB_RAW_URL/2dust/v2rayNG/master/CR.md"
+    const val APP_PROMOTION_URL = "aHR0cHM6Ly85LjIzNDQ1Ni54eXovYWJjLmh0bWw="
+    const val TG_CHANNEL_URL = "https://t.me/github_2dust"
+    const val DELAY_TEST_URL = "https://www.gstatic.com/generate_204"
+    const val DELAY_TEST_URL2 = "https://www.google.com/generate_204"
 
     /** DNS server addresses. */
     const val DNS_PROXY = "1.1.1.1"
@@ -200,9 +203,9 @@ object AppConfig {
         "240.0.0.0/4"
     )
     val GEO_FILES_SOURCES = arrayListOf(
-        "https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/",
-        "https://github.com/runetfreedom/russia-v2ray-rules-dat/releases/latest/download/",
-        "https://github.com/Chocolate4U/Iran-v2ray-rules/releases/latest/download/"
+        "$GITHUB_URL/Loyalsoldier/v2ray-rules-dat/$GITHUB_DOWNLOAD",
+        "$GITHUB_URL/runetfreedom/russia-v2ray-rules-dat/$GITHUB_DOWNLOAD",
+        "$GITHUB_URL/Chocolate4U/Iran-v2ray-rules/$GITHUB_DOWNLOAD"
     )
 
 }
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/dto/AssetUrlItem.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/dto/AssetUrlItem.kt
index d0703f09..5a8d1e60 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/dto/AssetUrlItem.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/dto/AssetUrlItem.kt
@@ -4,5 +4,6 @@ data class AssetUrlItem(
     var remarks: String = "",
     var url: String = "",
     val addedTime: Long = System.currentTimeMillis(),
-    var lastUpdated: Long = -1
+    var lastUpdated: Long = -1,
+    var locked: Boolean? = false,
 )
\ No newline at end of file
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/extension/_Ext.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/extension/_Ext.kt
index 9be86b6c..6e5c6bb4 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/extension/_Ext.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/extension/_Ext.kt
@@ -197,3 +197,16 @@ inline fun <reified T : Serializable> Intent.serializable(key: String): T? = whe
  * @return True if the CharSequence is not null and not empty, false otherwise.
  */
 fun CharSequence?.isNotNullEmpty(): Boolean = this != null && this.isNotEmpty()
+
+fun String.concatUrl(vararg paths: String): String {
+    val builder = StringBuilder(this.trimEnd('/'))
+
+    paths.forEach { path ->
+        val trimmedPath = path.trim('/')
+        if (trimmedPath.isNotEmpty()) {
+            builder.append('/').append(trimmedPath)
+        }
+    }
+
+    return builder.toString()
+}
\ No newline at end of file
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/SettingsManager.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/SettingsManager.kt
index aaf69d37..cb364531 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/SettingsManager.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/SettingsManager.kt
@@ -316,10 +316,10 @@ object SettingsManager {
      */
     fun getDelayTestUrl(second: Boolean = false): String {
         return if (second) {
-            AppConfig.DelayTestUrl2
+            AppConfig.DELAY_TEST_URL2
         } else {
             MmkvManager.decodeSettingsString(AppConfig.PREF_DELAY_TEST_URL)
-                ?: AppConfig.DelayTestUrl
+                ?: AppConfig.DELAY_TEST_URL
         }
     }
 
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/UpdateCheckerManager.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/UpdateCheckerManager.kt
index 518c780b..e152002f 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/UpdateCheckerManager.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/UpdateCheckerManager.kt
@@ -7,6 +7,7 @@ import com.v2ray.ang.AppConfig
 import com.v2ray.ang.BuildConfig
 import com.v2ray.ang.dto.CheckUpdateResult
 import com.v2ray.ang.dto.GitHubRelease
+import com.v2ray.ang.extension.concatUrl
 import com.v2ray.ang.util.HttpUtil
 import com.v2ray.ang.util.JsonUtil
 import kotlinx.coroutines.Dispatchers
@@ -18,9 +19,9 @@ object UpdateCheckerManager {
     suspend fun checkForUpdate(includePreRelease: Boolean = false): CheckUpdateResult = withContext(Dispatchers.IO) {
         try {
             val url = if (includePreRelease) {
-                AppConfig.v2rayNGAPIUrl
+                AppConfig.APP_API_URL
             } else {
-                "${AppConfig.v2rayNGAPIUrl}/latest"
+                AppConfig.APP_API_URL.concatUrl("latest")
             }
 
             var response = HttpUtil.getUrlContent(url, 5000)
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/AboutActivity.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/AboutActivity.kt
index da79f3ed..7c2ffdba 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/AboutActivity.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/AboutActivity.kt
@@ -123,11 +123,11 @@ class AboutActivity : BaseActivity() {
         binding.checkPreRelease.isChecked = MmkvManager.decodeSettingsBool(AppConfig.PREF_CHECK_UPDATE_PRE_RELEASE, false)
 
         binding.layoutSoureCcode.setOnClickListener {
-            Utils.openUri(this, AppConfig.v2rayNGUrl)
+            Utils.openUri(this, AppConfig.APP_URL)
         }
 
         binding.layoutFeedback.setOnClickListener {
-            Utils.openUri(this, AppConfig.v2rayNGIssues)
+            Utils.openUri(this, AppConfig.APP_ISSUES_URL)
         }
 
         binding.layoutOssLicenses.setOnClickListener {
@@ -141,11 +141,11 @@ class AboutActivity : BaseActivity() {
         }
 
         binding.layoutTgChannel.setOnClickListener {
-            Utils.openUri(this, AppConfig.TgChannelUrl)
+            Utils.openUri(this, AppConfig.TG_CHANNEL_URL)
         }
 
         binding.layoutPrivacyPolicy.setOnClickListener {
-            Utils.openUri(this, AppConfig.v2rayNGPrivacyPolicy)
+            Utils.openUri(this, AppConfig.APP_PRIVACY_POLICY)
         }
 
         "v${BuildConfig.VERSION_NAME} (${SpeedtestManager.getLibVersion()})".also {
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/MainActivity.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/MainActivity.kt
index b4e8ac44..bb9abc68 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/MainActivity.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/MainActivity.kt
@@ -683,7 +683,7 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
                     .putExtra("isRunning", mainViewModel.isRunning.value == true)
             )
 
-            R.id.promotion -> Utils.openUri(this, "${Utils.decode(AppConfig.PromotionUrl)}?t=${System.currentTimeMillis()}")
+            R.id.promotion -> Utils.openUri(this, "${Utils.decode(AppConfig.APP_PROMOTION_URL)}?t=${System.currentTimeMillis()}")
             R.id.logcat -> startActivity(Intent(this, LogcatActivity::class.java))
             R.id.about -> startActivity(Intent(this, AboutActivity::class.java))
         }
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/PerAppProxyActivity.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/PerAppProxyActivity.kt
index 97afe573..54e10974 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/PerAppProxyActivity.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/PerAppProxyActivity.kt
@@ -157,7 +157,7 @@ class PerAppProxyActivity : BaseActivity() {
         toast(R.string.msg_downloading_content)
         binding.pbWaiting.show()
 
-        val url = AppConfig.androidpackagenamelistUrl
+        val url = AppConfig.ANDROID_PACKAGE_NAME_LIST_URL
         lifecycleScope.launch(Dispatchers.IO) {
             var content = HttpUtil.getUrlContent(url, 5000)
             if (content.isNullOrEmpty()) {
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/SettingsActivity.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/SettingsActivity.kt
index 9423310c..4ec2294a 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/SettingsActivity.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/SettingsActivity.kt
@@ -161,7 +161,7 @@ class SettingsActivity : BaseActivity() {
             }
             delayTestUrl?.setOnPreferenceChangeListener { _, any ->
                 val nval = any as String
-                delayTestUrl?.summary = if (nval == "") AppConfig.DelayTestUrl else nval
+                delayTestUrl?.summary = if (nval == "") AppConfig.DELAY_TEST_URL else nval
                 true
             }
             mode?.setOnPreferenceChangeListener { _, newValue ->
@@ -202,7 +202,7 @@ class SettingsActivity : BaseActivity() {
             remoteDns?.summary = MmkvManager.decodeSettingsString(AppConfig.PREF_REMOTE_DNS, AppConfig.DNS_PROXY)
             domesticDns?.summary = MmkvManager.decodeSettingsString(AppConfig.PREF_DOMESTIC_DNS, AppConfig.DNS_DIRECT)
             dnsHosts?.summary = MmkvManager.decodeSettingsString(AppConfig.PREF_DNS_HOSTS)
-            delayTestUrl?.summary = MmkvManager.decodeSettingsString(AppConfig.PREF_DELAY_TEST_URL, AppConfig.DelayTestUrl)
+            delayTestUrl?.summary = MmkvManager.decodeSettingsString(AppConfig.PREF_DELAY_TEST_URL, AppConfig.DELAY_TEST_URL)
 
             initSharedPreference()
         }
@@ -364,6 +364,6 @@ class SettingsActivity : BaseActivity() {
     }
 
     fun onModeHelpClicked(view: View) {
-        Utils.openUri(this, AppConfig.v2rayNGWikiMode)
+        Utils.openUri(this, AppConfig.APP_WIKI_MODE)
     }
 }
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/UserAssetActivity.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/UserAssetActivity.kt
index 41cad466..526dfc88 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/UserAssetActivity.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/UserAssetActivity.kt
@@ -24,6 +24,7 @@ import com.v2ray.ang.R
 import com.v2ray.ang.databinding.ActivityUserAssetBinding
 import com.v2ray.ang.databinding.ItemRecyclerUserAssetBinding
 import com.v2ray.ang.dto.AssetUrlItem
+import com.v2ray.ang.extension.concatUrl
 import com.v2ray.ang.extension.toTrafficString
 import com.v2ray.ang.extension.toast
 import com.v2ray.ang.extension.toastError
@@ -121,8 +122,11 @@ class UserAssetActivity : BaseActivity() {
     }
 
     private fun setGeoFilesSources() {
-        AlertDialog.Builder(this).setItems(AppConfig.GEO_FILES_SOURCES
-            .toTypedArray()) { _, i ->
+        AlertDialog.Builder(this).setItems(
+            AppConfig.GEO_FILES_SOURCES
+                .map { it.replace(AppConfig.GITHUB_URL + "/", "").replace("/" + AppConfig.GITHUB_DOWNLOAD, "") }
+                .toTypedArray()
+        ) { _, i ->
             try {
                 val value = AppConfig.GEO_FILES_SOURCES[i]
                 MmkvManager.encodeSettings(AppConfig.PREF_GEO_FILES_SOURCES, value)
@@ -286,7 +290,8 @@ class UserAssetActivity : BaseActivity() {
                 list.add(
                     Utils.getUuid() to AssetUrlItem(
                         it,
-                        getGeoFilesSources() + it
+                        getGeoFilesSources().concatUrl(it),
+                        locked = true
                     )
                 )
             }
@@ -337,7 +342,7 @@ class UserAssetActivity : BaseActivity() {
                 holder.itemUserAssetBinding.assetProperties.text = getString(R.string.msg_file_not_found)
             }
 
-            if (item.second.remarks in builtInGeoFiles && item.second.url == getGeoFilesSources() + item.second.remarks) {
+            if (item.second.locked == true) {
                 holder.itemUserAssetBinding.layoutEdit.visibility = GONE
                 //holder.itemUserAssetBinding.layoutRemove.visibility = GONE
             } else {