diff --git a/app/build.gradle b/app/build.gradle
index 3e495edf..5af8b0f1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,7 +9,7 @@ android {
 
     defaultConfig {
         minSdkVersion 26
-        targetSdkVersion 26
+        targetSdkVersion 28
     }
 
     buildTypes {
@@ -50,6 +50,7 @@ gradle.projectsEvaluated {
     }
 }
 
+// http://www.31mins.com/android-studio-build-system-application/
 preBuild.doLast {
     def imlFile = file(project.name + ".iml")
 
diff --git a/app/src/main/Android.mk b/app/src/main/Android.mk
index b83908e9..28df4ae6 100644
--- a/app/src/main/Android.mk
+++ b/app/src/main/Android.mk
@@ -16,19 +16,20 @@ LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/sysconfig
 LOCAL_SRC_FILES := $(LOCAL_MODULE)
 include $(BUILD_PREBUILT)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := optional
+LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := \
+    commons-io:../../libs/commons-io-2.6.jar
+include $(BUILD_MULTI_PREBUILT)
+
 include $(CLEAR_VARS)
 LOCAL_PACKAGE_NAME := Backup
 LOCAL_MODULE_TAGS := optional
 LOCAL_REQUIRED_MODULES := permissions_com.stevesoltys.backup.xml whitelist_com.stevesoltys.backup.xml
 LOCAL_PRIVILEGED_MODULE := true
 LOCAL_PRIVATE_PLATFORM_APIS := true
+LOCAL_CERTIFICATE := platform
 LOCAL_STATIC_JAVA_LIBRARIES := commons-io
 LOCAL_SRC_FILES := $(call all-java-files-under, java)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
 include $(BUILD_PACKAGE)
-
-include $(CLEAR_VARS)
-LOCAL_MODULE_TAGS := optional
-LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES := \
-    commons-io:../../libs/commons-io-2.6.jar
-include $(BUILD_MULTI_PREBUILT)
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 0a6050ca..7e5e1297 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -7,7 +7,7 @@
 
     <uses-sdk
         android:minSdkVersion="26"
-        android:targetSdkVersion="26"
+        android:targetSdkVersion="28"
         tools:ignore="GradleOverrides,OldTargetApi" />
 
     <uses-permission