diff --git a/app/src/main/java/com/topjohnwu/magisk/model/events/ViewEvents.kt b/app/src/main/java/com/topjohnwu/magisk/model/events/ViewEvents.kt
index 9c3c725da..ce8d439ce 100644
--- a/app/src/main/java/com/topjohnwu/magisk/model/events/ViewEvents.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/model/events/ViewEvents.kt
@@ -1,6 +1,7 @@
 package com.topjohnwu.magisk.model.events
 
 import android.app.Activity
+import android.content.Intent
 import androidx.appcompat.app.AppCompatActivity
 import com.karumi.dexter.Dexter
 import com.karumi.dexter.MultiplePermissionsReport
@@ -96,3 +97,20 @@ class RecreateEvent : ViewEvent(), ActivityExecutor {
         activity.recreate()
     }
 }
+
+class RequestFileEvent : ViewEvent(), ActivityExecutor {
+    override fun invoke(activity: AppCompatActivity) {
+        Intent(Intent.ACTION_GET_CONTENT)
+            .setType("*/*")
+            .addCategory(Intent.CATEGORY_OPENABLE)
+            .also { activity.startActivityForResult(it, REQUEST_CODE) }
+    }
+
+    companion object {
+        private const val REQUEST_CODE = 10
+        fun resolve(requestCode: Int, resultCode: Int, data: Intent?) = data
+            ?.takeIf { resultCode == Activity.RESULT_OK }
+            ?.takeIf { requestCode == REQUEST_CODE }
+            ?.data
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatActivity.kt b/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatActivity.kt
index 8f79c78f7..f0cb17d5d 100644
--- a/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatActivity.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatActivity.kt
@@ -1,5 +1,6 @@
 package com.topjohnwu.magisk.redesign.compat
 
+import android.content.Intent
 import android.os.Bundle
 import android.view.View
 import android.view.ViewGroup
@@ -29,6 +30,11 @@ abstract class CompatActivity<ViewModel : CompatViewModel, Binding : ViewDataBin
 
     internal abstract val navHost: Int
 
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        navigation?.onActivityResult(requestCode, resultCode, data)
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
diff --git a/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatNavigationDelegate.kt b/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatNavigationDelegate.kt
index ec224af66..fba81411e 100644
--- a/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatNavigationDelegate.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatNavigationDelegate.kt
@@ -31,6 +31,9 @@ class CompatNavigationDelegate<out Source>(
         source.baseFragments[index].java.newInstance()
     //endregion
 
+    fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        controller.currentFrag?.onActivityResult(requestCode, resultCode, data)
+    }
 
     fun onCreate(savedInstanceState: Bundle?) = controller.run {
         rootFragmentListener = this@CompatNavigationDelegate
diff --git a/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatViewModel.kt b/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatViewModel.kt
index fb4cb11d1..8721cca2a 100644
--- a/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatViewModel.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/redesign/compat/CompatViewModel.kt
@@ -6,8 +6,9 @@ import androidx.databinding.Observable
 import com.topjohnwu.magisk.base.viewmodel.BaseViewModel
 import com.topjohnwu.magisk.utils.KObservableField
 import io.reactivex.disposables.Disposable
+import org.koin.core.KoinComponent
 
-abstract class CompatViewModel : BaseViewModel() {
+abstract class CompatViewModel : BaseViewModel(), KoinComponent {
 
     val insets = KObservableField(Insets.NONE)
 
diff --git a/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallFragment.kt b/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallFragment.kt
index 09efdae15..9690f3282 100644
--- a/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallFragment.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallFragment.kt
@@ -1,8 +1,10 @@
 package com.topjohnwu.magisk.ui.install
 
+import android.content.Intent
 import android.graphics.Insets
 import com.topjohnwu.magisk.R
 import com.topjohnwu.magisk.databinding.FragmentInstallMd2Binding
+import com.topjohnwu.magisk.model.events.RequestFileEvent
 import com.topjohnwu.magisk.redesign.compat.CompatFragment
 import org.koin.androidx.viewmodel.ext.android.viewModel
 
@@ -13,6 +15,11 @@ class InstallFragment : CompatFragment<InstallViewModel, FragmentInstallMd2Bindi
 
     override fun consumeSystemWindowInsets(insets: Insets) = insets
 
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        viewModel.data.value = RequestFileEvent.resolve(requestCode, resultCode, data)
+    }
+
     override fun onStart() {
         super.onStart()
         requireActivity().setTitle(R.string.install)
diff --git a/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallViewModel.kt b/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallViewModel.kt
index 6561f72df..9fc061e67 100644
--- a/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallViewModel.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/ui/install/InstallViewModel.kt
@@ -1,15 +1,56 @@
 package com.topjohnwu.magisk.ui.install
 
+import android.net.Uri
+import com.topjohnwu.magisk.R
+import com.topjohnwu.magisk.extensions.addOnPropertyChangedCallback
+import com.topjohnwu.magisk.model.download.DownloadService
+import com.topjohnwu.magisk.model.entity.internal.Configuration
+import com.topjohnwu.magisk.model.entity.internal.DownloadSubject
+import com.topjohnwu.magisk.model.events.RequestFileEvent
 import com.topjohnwu.magisk.redesign.compat.CompatViewModel
 import com.topjohnwu.magisk.utils.KObservableField
+import com.topjohnwu.superuser.Shell
+import com.topjohnwu.superuser.ShellUtils
+import org.koin.core.get
 
 class InstallViewModel : CompatViewModel() {
 
+    val isRooted = Shell.rootAccess()
+    val isAB = isABDevice()
+
     val step = KObservableField(0)
     val method = KObservableField(-1)
 
+    var data = KObservableField<Uri?>(null)
+
+    init {
+        method.addOnPropertyChangedCallback {
+            if (method.value == R.id.method_patch) {
+                RequestFileEvent().publish()
+            }
+        }
+    }
+
     fun step(nextStep: Int) {
         step.value = nextStep
     }
 
+    fun install() = DownloadService(get()) {
+        subject = DownloadSubject.Magisk(resolveConfiguration())
+    }
+
+    // ---
+
+    private fun resolveConfiguration() = when (method.value) {
+        R.id.method_download -> Configuration.Download
+        R.id.method_patch -> Configuration.Patch(data.value!!)
+        R.id.method_direct -> Configuration.Flash.Primary
+        R.id.method_inactive_slot -> Configuration.Flash.Secondary
+        else -> throw IllegalArgumentException("Unknown value")
+    }
+
+    private fun isABDevice() = ShellUtils
+        .fastCmd("grep_prop ro.build.ab_update")
+        .let { it.isNotEmpty() && it.toBoolean() }
+
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_install_md2.xml b/app/src/main/res/layout/fragment_install_md2.xml
index 9aadeedcf..0d279e7c4 100644
--- a/app/src/main/res/layout/fragment_install_md2.xml
+++ b/app/src/main/res/layout/fragment_install_md2.xml
@@ -143,7 +143,7 @@
                             android:id="@+id/install_step_method_button"
                             style="?styleButtonText"
                             gone="@{viewModel.step != 1}"
-                            isEnabled="@{viewModel.method != -1}"
+                            isEnabled="@{viewModel.method == @id/method_patch ? viewModel.data != null : viewModel.method != -1}"
                             android:layout_width="wrap_content"
                             android:layout_height="wrap_content"
                             android:onClick="@{() -> viewModel.step(2)}"
@@ -179,12 +179,14 @@
                             android:id="@+id/method_direct"
                             style="?styleRadioNormal"
                             android:layout_width="match_parent"
+                            gone="@{!viewModel.rooted}"
                             android:layout_height="wrap_content"
                             android:text="@string/direct_install" />
 
                         <com.google.android.material.radiobutton.MaterialRadioButton
                             android:id="@+id/method_inactive_slot"
                             style="?styleRadioNormal"
+                            gone="@{!viewModel.rooted || !viewModel.aB}"
                             android:layout_width="match_parent"
                             android:layout_height="wrap_content"
                             android:text="@string/install_inactive_slot" />
@@ -199,6 +201,7 @@
                 style="?styleButtonText"
                 gone="@{viewModel.step != 2}"
                 android:layout_width="wrap_content"
+                android:onClick="@{() -> viewModel.install()}"
                 android:layout_height="wrap_content"
                 android:layout_gravity="end"
                 android:layout_margin="@dimen/l1"