diff --git a/app/src/main/java/com/topjohnwu/magisk/model/download/CompoundDownloadService.kt b/app/src/main/java/com/topjohnwu/magisk/model/download/CompoundDownloadService.kt
index 4f1b708c4..b00108663 100644
--- a/app/src/main/java/com/topjohnwu/magisk/model/download/CompoundDownloadService.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/model/download/CompoundDownloadService.kt
@@ -8,8 +8,11 @@ import android.content.Intent
 import androidx.annotation.RequiresPermission
 import androidx.core.app.NotificationCompat
 import com.topjohnwu.magisk.ClassMap
-import com.topjohnwu.magisk.model.entity.internal.Configuration
+import com.topjohnwu.magisk.model.entity.internal.Configuration.*
+import com.topjohnwu.magisk.model.entity.internal.Configuration.Flash.Secondary
 import com.topjohnwu.magisk.model.entity.internal.DownloadSubject
+import com.topjohnwu.magisk.model.entity.internal.DownloadSubject.Magisk
+import com.topjohnwu.magisk.model.entity.internal.DownloadSubject.Module
 import com.topjohnwu.magisk.ui.flash.FlashActivity
 import java.io.File
 import kotlin.random.Random.Default.nextInt
@@ -20,27 +23,27 @@ open class CompoundDownloadService : SubstrateDownloadService() {
     private val context get() = this
 
     override fun onFinished(file: File, subject: DownloadSubject) = when (subject) {
-        is DownloadSubject.Magisk -> onFinishedInternal(file, subject)
-        is DownloadSubject.Module -> onFinishedInternal(file, subject)
+        is Magisk -> onFinishedInternal(file, subject)
+        is Module -> onFinishedInternal(file, subject)
     }
 
     private fun onFinishedInternal(
         file: File,
-        subject: DownloadSubject.Magisk
+        subject: Magisk
     ) = when (val conf = subject.configuration) {
-        Configuration.Download -> moveToDownloads(file)
-        Configuration.Flash -> FlashActivity.flash(this, file)
-        Configuration.Uninstall -> FlashActivity.uninstall(this, file)
-        is Configuration.Patch -> FlashActivity.patch(this, file, conf.fileUri)
+        Download -> moveToDownloads(file)
+        Uninstall -> FlashActivity.uninstall(this, file)
+        is Patch -> FlashActivity.patch(this, file, conf.fileUri)
+        is Flash -> FlashActivity.flash(this, file, conf is Secondary)
         else -> Unit
     }
 
     private fun onFinishedInternal(
         file: File,
-        subject: DownloadSubject.Module
+        subject: Module
     ) = when (subject.configuration) {
-        Configuration.Download -> moveToDownloads(file)
-        Configuration.Flash -> FlashActivity.install(this, file)
+        Download -> moveToDownloads(file)
+        is Flash -> FlashActivity.install(this, file)
         else -> Unit
     }
 
@@ -50,28 +53,27 @@ open class CompoundDownloadService : SubstrateDownloadService() {
         file: File,
         subject: DownloadSubject
     ) = when (subject) {
-        is DownloadSubject.Magisk -> addActionsInternal(file, subject)
-        is DownloadSubject.Module -> addActionsInternal(file, subject)
+        is Magisk -> addActionsInternal(file, subject)
+        is Module -> addActionsInternal(file, subject)
     }
 
     private fun NotificationCompat.Builder.addActionsInternal(
         file: File,
-        subject: DownloadSubject.Magisk
+        subject: Magisk
     ) = when (val conf = subject.configuration) {
-        Configuration.Download -> setContentIntent(fileIntent(subject.fileName))
-        Configuration.Flash -> setContentIntent(FlashActivity.flashIntent(context, file))
-        Configuration.Uninstall -> setContentIntent(FlashActivity.uninstallIntent(context, file))
-        is Configuration.Patch ->
-            setContentIntent(FlashActivity.patchIntent(context, file, conf.fileUri))
+        Download -> setContentIntent(fileIntent(subject.fileName))
+        Uninstall -> setContentIntent(FlashActivity.uninstallIntent(context, file))
+        is Flash -> setContentIntent(FlashActivity.flashIntent(context, file, conf is Secondary))
+        is Patch -> setContentIntent(FlashActivity.patchIntent(context, file, conf.fileUri))
         else -> this
     }
 
     private fun NotificationCompat.Builder.addActionsInternal(
         file: File,
-        subject: DownloadSubject.Module
+        subject: Module
     ) = when (subject.configuration) {
-        Configuration.Download -> setContentIntent(fileIntent(subject.fileName))
-        Configuration.Flash -> setContentIntent(FlashActivity.installIntent(context, file))
+        Download -> setContentIntent(fileIntent(subject.fileName))
+        is Flash -> setContentIntent(FlashActivity.installIntent(context, file))
         else -> this
     }
 
diff --git a/app/src/main/java/com/topjohnwu/magisk/model/download/SubstrateDownloadService.kt b/app/src/main/java/com/topjohnwu/magisk/model/download/SubstrateDownloadService.kt
index 445a1b965..547dec5ad 100644
--- a/app/src/main/java/com/topjohnwu/magisk/model/download/SubstrateDownloadService.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/model/download/SubstrateDownloadService.kt
@@ -14,8 +14,8 @@ import com.topjohnwu.magisk.Const
 import com.topjohnwu.magisk.R
 import com.topjohnwu.magisk.data.repository.FileRepository
 import com.topjohnwu.magisk.model.entity.internal.DownloadSubject
+import com.topjohnwu.magisk.utils.Utils
 import com.topjohnwu.magisk.utils.provide
-import com.topjohnwu.magisk.utils.toast
 import com.topjohnwu.magisk.utils.writeToCachedFile
 import com.topjohnwu.magisk.view.Notifications
 import com.topjohnwu.superuser.ShellUtils
@@ -98,7 +98,10 @@ abstract class SubstrateDownloadService : Service() {
             destination.deleteRecursively()
             file.copyTo(destination)
         }
-        toast(getString(R.string.internal_storage, "/Download/${file.name}"), Toast.LENGTH_LONG)
+        Utils.toast(
+            getString(R.string.internal_storage, "/Download/${file.name}"),
+            Toast.LENGTH_LONG
+        )
     }
 
     // ---
diff --git a/app/src/main/java/com/topjohnwu/magisk/model/entity/internal/Configuration.kt b/app/src/main/java/com/topjohnwu/magisk/model/entity/internal/Configuration.kt
index 407491441..40570d4b0 100644
--- a/app/src/main/java/com/topjohnwu/magisk/model/entity/internal/Configuration.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/model/entity/internal/Configuration.kt
@@ -6,8 +6,15 @@ import kotlinx.android.parcel.Parcelize
 
 sealed class Configuration : Parcelable {
 
-    @Parcelize
-    object Flash : Configuration()
+    sealed class Flash : Configuration() {
+
+        @Parcelize
+        object Primary : Flash()
+
+        @Parcelize
+        object Secondary : Flash()
+
+    }
 
     @Parcelize
     object Download : Configuration()
diff --git a/app/src/main/java/com/topjohnwu/magisk/ui/flash/FlashActivity.kt b/app/src/main/java/com/topjohnwu/magisk/ui/flash/FlashActivity.kt
index f80be4a40..06a598b9d 100644
--- a/app/src/main/java/com/topjohnwu/magisk/ui/flash/FlashActivity.kt
+++ b/app/src/main/java/com/topjohnwu/magisk/ui/flash/FlashActivity.kt
@@ -33,13 +33,16 @@ open class FlashActivity : MagiskActivity<FlashViewModel, ActivityFlashBinding>(
         private fun intent(context: Context) = Intent(context, ClassMap[FlashActivity::class.java])
         private fun intent(context: Context, file: File) = intent(context).setData(file.toUri())
 
+        private fun flashType(isSecondSlot: Boolean) =
+            if (isSecondSlot) Const.Value.FLASH_INACTIVE_SLOT else Const.Value.FLASH_MAGISK
+
         /* Flashing is understood as installing / flashing magisk itself */
 
-        fun flashIntent(context: Context, file: File) = intent(context, file)
-            .putExtra(Const.Key.FLASH_ACTION, Const.Value.FLASH_MAGISK)
+        fun flashIntent(context: Context, file: File, isSecondSlot: Boolean) = intent(context, file)
+            .putExtra(Const.Key.FLASH_ACTION, flashType(isSecondSlot))
 
-        fun flash(context: Context, file: File) =
-            context.startActivity(flashIntent(context, file))
+        fun flash(context: Context, file: File, isSecondSlot: Boolean) =
+            context.startActivity(flashIntent(context, file, isSecondSlot))
 
         /* Patching is understood as injecting img files with magisk */