diff --git a/manager/app/src/main/java/me/weishu/kernelsu/ui/MainActivity.kt b/manager/app/src/main/java/me/weishu/kernelsu/ui/MainActivity.kt
index 74af1c5b..c5a7e671 100644
--- a/manager/app/src/main/java/me/weishu/kernelsu/ui/MainActivity.kt
+++ b/manager/app/src/main/java/me/weishu/kernelsu/ui/MainActivity.kt
@@ -32,6 +32,7 @@ import me.weishu.kernelsu.ui.screen.NavGraphs
 import me.weishu.kernelsu.ui.theme.KernelSUTheme
 import me.weishu.kernelsu.ui.util.LocalDialogHost
 import me.weishu.kernelsu.ui.util.LocalSnackbarHost
+import me.weishu.kernelsu.ui.util.rootAvailable
 
 class MainActivity : ComponentActivity() {
 
@@ -66,7 +67,7 @@ class MainActivity : ComponentActivity() {
 @Composable
 private fun BottomBar(navController: NavHostController) {
     val isManager = Natives.becomeManager(ksuApp.packageName)
-    val fullFeatured = isManager && !Natives.requireNewKernel()
+    val fullFeatured = isManager && !Natives.requireNewKernel() && rootAvailable()
     NavigationBar(tonalElevation = 8.dp) {
         BottomBarDestination.values().forEach { destination ->
             if (!fullFeatured && destination.rootRequired) return@forEach
diff --git a/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Home.kt b/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Home.kt
index c8ff7c1a..d7affe1d 100644
--- a/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Home.kt
+++ b/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Home.kt
@@ -69,6 +69,11 @@ fun HomeScreen(navigator: DestinationsNavigator) {
                     )
                 )
             }
+            if (!rootAvailable()) {
+                WarningCard(
+                    stringResource(id = R.string.grant_root_failed)
+                )
+            }
             val checkUpdate =
                 LocalContext.current.getSharedPreferences("settings", Context.MODE_PRIVATE)
                     .getBoolean("check_update", true)
diff --git a/manager/app/src/main/java/me/weishu/kernelsu/ui/util/KsuCli.kt b/manager/app/src/main/java/me/weishu/kernelsu/ui/util/KsuCli.kt
index 2af97e03..56372779 100644
--- a/manager/app/src/main/java/me/weishu/kernelsu/ui/util/KsuCli.kt
+++ b/manager/app/src/main/java/me/weishu/kernelsu/ui/util/KsuCli.kt
@@ -140,6 +140,11 @@ fun reboot(reason: String = "") {
     ShellUtils.fastCmd(shell, "/system/bin/svc power reboot $reason || /system/bin/reboot $reason")
 }
 
+fun rootAvailable(): Boolean {
+    val shell = getRootShell()
+    return shell.isRoot
+}
+
 fun overlayFsAvailable(): Boolean {
     val shell = getRootShell()
     // check /proc/filesystems
diff --git a/manager/app/src/main/res/values-zh-rCN/strings.xml b/manager/app/src/main/res/values-zh-rCN/strings.xml
index d6a9d912..af912046 100644
--- a/manager/app/src/main/res/values-zh-rCN/strings.xml
+++ b/manager/app/src/main/res/values-zh-rCN/strings.xml
@@ -102,4 +102,7 @@
     <string name="app_profile_template_save_failed">模版保存失败！</string>
     <string name="app_profile_template_import_empty">剪切板为空！</string>
     <string name="module_changelog_failed">获取更新日志失败：%s</string>
+    <string name="settings_check_update">检查更新</string>
+    <string name="settings_check_update_summary">在应用启动后自动检查是否有最新版</string>
+    <string name="grant_root_failed">获取 root 失败！</string>
 </resources>
\ No newline at end of file
diff --git a/manager/app/src/main/res/values/strings.xml b/manager/app/src/main/res/values/strings.xml
index 58add6e9..9675566a 100644
--- a/manager/app/src/main/res/values/strings.xml
+++ b/manager/app/src/main/res/values/strings.xml
@@ -106,4 +106,5 @@
     <string name="module_changelog_failed">Fetch changelog failed: %s</string>
     <string name="settings_check_update">Check update</string>
     <string name="settings_check_update_summary">Automatically check for updates when opening the app</string>
+    <string name="grant_root_failed">Failed to grant root!</string>
 </resources>