diff --git a/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Module.kt b/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Module.kt
index 32929bd9..f4505ef2 100644
--- a/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Module.kt
+++ b/manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Module.kt
@@ -27,6 +27,7 @@ import com.google.accompanist.swiperefresh.rememberSwipeRefreshState
 import com.ramcosta.composedestinations.annotation.Destination
 import com.ramcosta.composedestinations.navigation.DestinationsNavigator
 import kotlinx.coroutines.launch
+import me.weishu.kernelsu.Natives
 import me.weishu.kernelsu.R
 import me.weishu.kernelsu.ui.screen.destinations.InstallScreenDestination
 import me.weishu.kernelsu.ui.util.LocalSnackbarHost
@@ -85,6 +86,12 @@ fun ModuleScreen(navigator: DestinationsNavigator) {
         val failedDisable = stringResource(R.string.module_failed_to_disable)
         val swipeState = rememberSwipeRefreshState(viewModel.isRefreshing)
         // TODO: Replace SwipeRefresh with RefreshIndicator when it's ready
+        if (Natives.getVersion() < 8) {
+            Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                Text(stringResource(R.string.require_kernel_version_8))
+            }
+            return@Scaffold
+        }
         SwipeRefresh(
             state = swipeState,
             onRefresh = {
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 4e47db39..6ffc8aaa 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
@@ -1,6 +1,7 @@
 package me.weishu.kernelsu.ui.util
 
 import android.net.Uri
+import android.os.SystemClock
 import android.util.Log
 import com.topjohnwu.superuser.CallbackList
 import com.topjohnwu.superuser.Shell
@@ -37,8 +38,9 @@ fun execKsud(args: String): Boolean {
 }
 
 fun install() {
+    val start = SystemClock.elapsedRealtime()
     val result = execKsud("install")
-    Log.w(TAG, "install ksud result: $result")
+    Log.w(TAG, "install result: $result, cost: ${SystemClock.elapsedRealtime() - start}ms")
 }
 
 fun listModules(): String {
diff --git a/manager/app/src/main/res/values/strings.xml b/manager/app/src/main/res/values/strings.xml
index 80c12719..1bca4d35 100644
--- a/manager/app/src/main/res/values/strings.xml
+++ b/manager/app/src/main/res/values/strings.xml
@@ -31,4 +31,5 @@
     <string name="settings_system_rw">Make system writable</string>
     <string name="settings_system_rw_summary">Use overlayfs to make system partition writable, reboot to take effect.</string>
     <string name="about">About</string>
+    <string name="require_kernel_version_8">Require KernelSU version 8+</string>
 </resources>