diff --git a/Application/Application.iml b/Application/Application.iml
index c0ac476..d209cc6 100644
--- a/Application/Application.iml
+++ b/Application/Application.iml
@@ -113,7 +113,7 @@
       <excludeFolder url="file://$MODULE_DIR$/build/outputs" />
       <excludeFolder url="file://$MODULE_DIR$/build/tmp" />
     </content>
-    <orderEntry type="jdk" jdkName="Android API 28 Platform" jdkType="Android SDK" />
+    <orderEntry type="jdk" jdkName="Android API 27 Platform" jdkType="Android SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="Gradle: com.android.support:support-v4-27.1.1" level="project" />
     <orderEntry type="library" name="Gradle: android.arch.lifecycle:common:1.1.0@jar" level="project" />
diff --git a/Application/build.gradle b/Application/build.gradle
index ccd98bd..3c6d507 100644
--- a/Application/build.gradle
+++ b/Application/build.gradle
@@ -39,9 +39,9 @@ List<String> dirs = [
     'template'] // boilerplate code that is generated by the sample template process
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 27
 
-    buildToolsVersion '28.0.3'
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         minSdkVersion 21
@@ -59,13 +59,12 @@ android {
             storeFile file("../keystore-uwepost.de.jks")
             storePassword "kliej4uwzikusjdczhgfjkusrzhtrio8sduzti8s45euz56i87c45z6987cz"
             keyAlias "sign"
-            keyPassword "kliej4uwzikusjdczhgfjkusrzhtrio8sduzti8s45euz56i87c45z6987cz"
+            keyPassword ""
         }
     }
     buildTypes {
         release {
             minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             signingConfig signingConfigs.releaseConfig
         }
     }