diff --git a/app/src/main/java/com/bintianqi/owndroid/dpm/ApplicationManage.kt b/app/src/main/java/com/bintianqi/owndroid/dpm/ApplicationManage.kt
index 0987ca5..c15c440 100644
--- a/app/src/main/java/com/bintianqi/owndroid/dpm/ApplicationManage.kt
+++ b/app/src/main/java/com/bintianqi/owndroid/dpm/ApplicationManage.kt
@@ -84,6 +84,7 @@ fun ApplicationManage(navCtrl:NavHostController, pkgName: MutableState<String>,
     )
     val clearAppDataDialog = remember { mutableStateOf(false) }
     val defaultDialerAppDialog = remember { mutableStateOf(false) }
+    val enableSystemAppDialog = remember { mutableStateOf(false) }
     Scaffold(
         topBar = {
             TopBar(backStackEntry, navCtrl, localNavCtrl) {
@@ -119,7 +120,9 @@ fun ApplicationManage(navCtrl:NavHostController, pkgName: MutableState<String>,
                 popEnterTransition = Animations.navHostPopEnterTransition,
                 popExitTransition = Animations.navHostPopExitTransition
             ) { 
-                composable(route = "Home") { Home(localNavCtrl, pkgName.value, dialogStatus, clearAppDataDialog, defaultDialerAppDialog) }
+                composable(route = "Home") {
+                    Home(localNavCtrl, pkgName.value, dialogStatus, clearAppDataDialog, defaultDialerAppDialog, enableSystemAppDialog)
+                }
                 composable(route = "UserControlDisabled") { UserCtrlDisabledPkg(pkgName.value) }
                 composable(route = "PermissionManage") { PermissionManage(pkgName.value, navCtrl) }
                 composable(route = "CrossProfilePackage") { CrossProfilePkg(pkgName.value) }
@@ -143,6 +146,9 @@ fun ApplicationManage(navCtrl:NavHostController, pkgName: MutableState<String>,
     if(defaultDialerAppDialog.value) {
         DefaultDialerAppDialog(defaultDialerAppDialog, pkgName.value)
     }
+    if(enableSystemAppDialog.value) {
+        EnableSystemAppDialog(enableSystemAppDialog, pkgName.value)
+    }
 }
 
 @Composable
@@ -151,7 +157,8 @@ private fun Home(
     pkgName: String,
     dialogStatus: MutableIntState,
     clearAppDataDialog: MutableState<Boolean>,
-    defaultDialerAppDialog: MutableState<Boolean>
+    defaultDialerAppDialog: MutableState<Boolean>,
+    enableSystemAppDialog: MutableState<Boolean>
 ) {
     Column(
         modifier = Modifier.fillMaxSize().verticalScroll(rememberScrollState())
@@ -255,6 +262,9 @@ private fun Home(
         if(isDeviceOwner(dpm)||isProfileOwner(dpm)) { 
             SubPageItem(R.string.permitted_ime, "", R.drawable.keyboard_fill0) { navCtrl.navigate("IME") }
         }
+        if(isDeviceOwner(dpm) || isProfileOwner(dpm)) {
+            SubPageItem(R.string.enable_system_app, "", R.drawable.enable_fill0) { enableSystemAppDialog.value = true }
+        }
         if(VERSION.SDK_INT>=28&&isDeviceOwner(dpm)) { 
             SubPageItem(R.string.keep_uninstalled_packages, "", R.drawable.delete_fill0) { navCtrl.navigate("KeepUninstalled") }
         }
@@ -932,9 +942,7 @@ private fun ClearAppDataDialog(status: MutableState<Boolean>, pkgName: String) {
     val dpm = context.getSystemService(ComponentActivity.DEVICE_POLICY_SERVICE) as DevicePolicyManager
     val receiver = ComponentName(context,Receiver::class.java)
     AlertDialog(
-        title = {
-            Text(text = stringResource(R.string.clear_app_storage))
-        },
+        title = { Text(text = stringResource(R.string.clear_app_storage)) },
         text = {
             Text(stringResource(R.string.app_storage_will_be_cleared) + "\n" + pkgName)
         },
@@ -977,9 +985,7 @@ private fun DefaultDialerAppDialog(status: MutableState<Boolean>, pkgName: Strin
     val context = LocalContext.current
     val dpm = context.getSystemService(ComponentActivity.DEVICE_POLICY_SERVICE) as DevicePolicyManager
     AlertDialog(
-        title = {
-            Text(stringResource(R.string.set_default_dialer))
-        },
+        title = { Text(stringResource(R.string.set_default_dialer)) },
         text = {
             Text(stringResource(R.string.app_will_be_default_dialer) + "\n" + pkgName)
         },
@@ -1008,6 +1014,41 @@ private fun DefaultDialerAppDialog(status: MutableState<Boolean>, pkgName: Strin
     )
 }
 
+@Composable
+private fun EnableSystemAppDialog(status: MutableState<Boolean>, pkgName: String) {
+    val context = LocalContext.current
+    val dpm = context.getSystemService(ComponentActivity.DEVICE_POLICY_SERVICE) as DevicePolicyManager
+    val receiver = ComponentName(context,Receiver::class.java)
+    AlertDialog(
+        title = { Text(stringResource(R.string.enable_system_app)) },
+        text = {
+            Text(stringResource(R.string.enable_system_app_desc) + "\n" + pkgName)
+        },
+        onDismissRequest = { status.value = false },
+        dismissButton = {
+            TextButton(onClick = { status.value = false }) {
+                Text(stringResource(R.string.cancel))
+            }
+        },
+        confirmButton = {
+            TextButton(
+                onClick = {
+                    try {
+                        dpm.enableSystemApp(receiver, pkgName)
+                        Toast.makeText(context, R.string.success, Toast.LENGTH_SHORT).show()
+                    } catch(e: IllegalArgumentException) {
+                        Toast.makeText(context, R.string.fail, Toast.LENGTH_SHORT).show()
+                    }
+                    status.value = false
+                }
+            ) {
+                Text(stringResource(R.string.confirm))
+            }
+        },
+        modifier = Modifier.fillMaxWidth()
+    )
+}
+
 @Composable
 private fun AppControlDialog(status: MutableIntState) {
     val enabled = dialogGetStatus()
diff --git a/app/src/main/java/com/bintianqi/owndroid/dpm/SystemManager.kt b/app/src/main/java/com/bintianqi/owndroid/dpm/SystemManager.kt
index 9154a99..caca350 100644
--- a/app/src/main/java/com/bintianqi/owndroid/dpm/SystemManager.kt
+++ b/app/src/main/java/com/bintianqi/owndroid/dpm/SystemManager.kt
@@ -105,6 +105,7 @@ import com.bintianqi.owndroid.ui.TopBar
 import com.bintianqi.owndroid.uriToStream
 import java.util.Date
 import java.util.TimeZone
+import java.util.concurrent.Executors
 
 @Composable
 fun SystemManage(navCtrl:NavHostController) {
@@ -1121,8 +1122,9 @@ fun InstallSystemUpdate() {
         AnimatedVisibility(uri != Uri.parse("")) {
             Button(
                 onClick = {
+                    val executor = Executors.newCachedThreadPool()
                     try {
-                        dpm.installSystemUpdate(receiver, uri, { it.run() }, callback)
+                        dpm.installSystemUpdate(receiver, uri, executor, callback)
                         Toast.makeText(context, R.string.start_install_system_update, Toast.LENGTH_SHORT).show()
                     }catch(e: Exception) {
                         Toast.makeText(
diff --git a/app/src/main/res/drawable/enable_fill0.xml b/app/src/main/res/drawable/enable_fill0.xml
new file mode 100644
index 0000000..7254632
--- /dev/null
+++ b/app/src/main/res/drawable/enable_fill0.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:pathData="M480,880q-83,0 -156,-31.5T197,763q-54,-54 -85.5,-127T80,480q0,-132 77,-237.5T360,98v86q-91,37 -145.5,117.5T160,480q0,134 93,227t227,93q134,0 227,-93t93,-227q0,-98 -54.5,-178.5T600,184v-86q126,39 203,144.5T880,480q0,83 -31.5,156T763,763q-54,54 -127,85.5T480,880ZM480,640L280,440l56,-56 104,103v-407h80v407l104,-103 56,56 -200,200Z"
+      android:fillColor="#000000"/>
+</vector>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 2f2a161..13573e3 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -304,6 +304,8 @@
     <string name="select_apk" tools:ignore="TypographyEllipsis">选择APK...</string>
     <string name="silent_install">静默安装</string>
     <string name="request_install">请求安装</string>
+    <string name="enable_system_app">启用系统应用</string>
+    <string name="enable_system_app_desc">重新启用一个默认被禁用的系统应用</string>
     <string name="app_installer_status">应用安装器：</string>
     <string name="status_pending_action">等待用户操作</string>
     <string name="status_fail_blocked">被阻止</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 7fd91d1..1491013 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -289,6 +289,8 @@
     <string name="app_info">App info</string>
     <string name="not_installed">Not installed</string>
     <string name="block_uninstall">Block uninstall</string>
+    <string name="enable_system_app">Enable system app</string>
+    <string name="enable_system_app_desc">Re-enable a system app that was disabled by default</string>
     <!--ucd: user control disabled-->
     <string name="ucd">Disable user control</string>
     <string name="ucd_desc">If you set this, you cannot clear these apps\' storage or force stop them. </string>