diff --git a/SecScanQR-master.iml b/SecScanQR-master.iml
index 006dc599..e529adc5 100644
--- a/SecScanQR-master.iml
+++ b/SecScanQR-master.iml
@@ -13,7 +13,7 @@
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/.gradle" />
     </content>
-    <orderEntry type="inheritedJdk" />
+    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>
\ No newline at end of file
diff --git a/app/app.iml b/app/app.iml
index 50e824ff..bdeb3da2 100644
--- a/app/app.iml
+++ b/app/app.iml
@@ -23,19 +23,19 @@
     </facet>
   </component>
   <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7">
-    <output url="file://$MODULE_DIR$/build/intermediates/javac/debug/compileDebugJavaWithJavac/classes" />
-    <output-test url="file://$MODULE_DIR$/build/intermediates/javac/debugUnitTest/compileDebugUnitTestJavaWithJavac/classes" />
+    <output url="file://$MODULE_DIR$/build/intermediates/classes/debug" />
+    <output-test url="file://$MODULE_DIR$/build/intermediates/classes/test/debug" />
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/apt/debug" isTestSource="false" generated="true" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/not_namespaced_r_class_sources/debug/processDebugResources/r" isTestSource="false" generated="true" />
+      <sourceFolder url="file://$MODULE_DIR$/build/generated/source/r/debug" isTestSource="false" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/aidl/debug" isTestSource="false" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/buildConfig/debug" isTestSource="false" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/rs/debug" isTestSource="false" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/res/rs/debug" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/res/resValues/debug" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/apt/androidTest/debug" isTestSource="true" generated="true" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/not_namespaced_r_class_sources/debugAndroidTest/processDebugAndroidTestResources/r" isTestSource="true" generated="true" />
+      <sourceFolder url="file://$MODULE_DIR$/build/generated/source/r/androidTest/debug" isTestSource="true" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/aidl/androidTest/debug" isTestSource="true" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/buildConfig/androidTest/debug" isTestSource="true" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/rs/androidTest/debug" isTestSource="true" generated="true" />
@@ -84,78 +84,72 @@
       <sourceFolder url="file://$MODULE_DIR$/src/androidTest/java" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/src/androidTest/rs" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/src/androidTest/shaders" isTestSource="true" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/annotation_processor_list" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/apk_list" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/assets" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/blame" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/build-info" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/builds" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/check-libraries" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/check-manifest" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/checkDebugClasspath" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/classes" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/compatible_screen_manifest" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/incremental" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/incremental-classes" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/incremental-runtime-classes" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/incremental-verifier" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/instant-run-apk" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/instant_run_main_apk_resources" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/instant-run-resources" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/instant-run-support" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/instant_run_merged_manifests" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/instant_run_split_apk_resources" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/javac" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/javaPrecompile" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/jniLibs" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/lint" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/lint_jar" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/manifest-checker" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/merged_assets" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/manifests" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/merged_manifests" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/prebuild" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/processed_res" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/reload-dex" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/res" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/resources" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/rs" />
-      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/shader_assets" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/shaders" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/split-apk" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/split_list" />
+      <excludeFolder url="file://$MODULE_DIR$/build/intermediates/splits-support" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/symbols" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/transforms" />
       <excludeFolder url="file://$MODULE_DIR$/build/outputs" />
       <excludeFolder url="file://$MODULE_DIR$/build/tmp" />
     </content>
-    <orderEntry type="jdk" jdkName="Android API 26 Platform" jdkType="Android SDK" />
+    <orderEntry type="jdk" jdkName="Android API 25 Platform" jdkType="Android SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Gradle: com.android.support.constraint:constraint-layout-solver:1.0.2@jar" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:appcompat-v7-25.3.1" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-fragment-25.3.1" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-annotations:25.3.1@jar" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.android.support.test.espresso:espresso-idling-resource-2.2.2" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:animated-vector-drawable-26.1.0" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-media-compat-25.3.1" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: javax.annotation:javax.annotation-api:1.2@jar" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:transition-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:appcompat-v7-26.1.0" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.android.support.test.espresso:espresso-core-2.2.2" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-fragment-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: android.arch.core:common:1.0.0@jar" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.squareup:javawriter:2.1.1@jar" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:animated-vector-drawable-25.3.1" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-compat-25.3.1" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.android.support.test:rules-0.5" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support.constraint:constraint-layout-1.1.2" level="project" />
     <orderEntry type="library" name="Gradle: com.journeyapps:zxing-android-embedded-3.2.0" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-media-compat-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-annotations:26.1.0@jar" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-v4-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-compat-26.1.0" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:transition-25.3.1" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.google.code.findbugs:jsr305:2.0.1@jar" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:recyclerview-v7-26.1.0" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: javax.inject:javax.inject:1@jar" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-v4-25.3.1" level="project" />
     <orderEntry type="library" name="Gradle: com.google.zxing:core:3.2.1@jar" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support.constraint:constraint-layout-1.0.2" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: junit:junit:4.12@jar" level="project" />
-    <orderEntry type="library" name="Gradle: android.arch.lifecycle:common:1.0.0@jar" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: org.hamcrest:hamcrest-core:1.3@jar" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-vector-drawable-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-core-ui-26.1.0" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-core-ui-25.3.1" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.android.support.test:runner-0.5" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:support-core-utils-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support.constraint:constraint-layout-solver:1.1.2@jar" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: com.android.support.test:exposed-instrumentation-api-publish-0.5" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: org.hamcrest:hamcrest-library:1.3@jar" level="project" />
     <orderEntry type="library" scope="TEST" name="Gradle: org.hamcrest:hamcrest-integration:1.3@jar" level="project" />
-    <orderEntry type="library" name="Gradle: com.android.support:design-26.1.0" level="project" />
-    <orderEntry type="library" name="Gradle: android.arch.lifecycle:runtime-1.0.0" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:recyclerview-v7-25.3.1" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:design-25.3.1" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-vector-drawable-25.3.1" level="project" />
+    <orderEntry type="library" name="Gradle: com.android.support:support-core-utils-25.3.1" level="project" />
   </component>
 </module>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 7e63fdb4..acadf437 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion '28.0.3'
+    compileSdkVersion 25
+    buildToolsVersion '26.0.2'
     defaultConfig {
         applicationId "de.t_dankworth.secscanqr"
         minSdkVersion 17
-        targetSdkVersion 26
-        versionCode 11
-        versionName "1.1.8"
+        targetSdkVersion 23
+        versionCode 12
+        versionName "1.1.9"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
@@ -28,12 +28,13 @@ dependencies {
     androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    implementation 'com.android.support:appcompat-v7:26.1.0'
-    implementation 'com.android.support:design:26.1.0'
-    implementation 'com.android.support:support-vector-drawable:26.1.0'
+    implementation 'com.android.support:appcompat-v7:25.3.1'
+    implementation 'com.android.support:design:25.3.1'
+    implementation 'com.android.support:support-vector-drawable:25.3.1'
     implementation 'com.google.zxing:core:3.2.1'
     implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
-    implementation 'com.android.support:support-v4:26.1.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
+    implementation 'com.android.support:support-v4:25.3.1'
     testImplementation 'junit:junit:4.12'
+
 }
diff --git a/build.gradle b/build.gradle
index 0dd5ade6..833e3b3a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.1'
+        classpath 'com.android.tools.build:gradle:3.0.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/local.properties b/local.properties
index 562fc1d3..9ea6322a 100644
--- a/local.properties
+++ b/local.properties
@@ -1,8 +1,8 @@
-## This file must *NOT* be checked into Version Control Systems,
-# as it contains information specific to your local configuration.
-#
-# Location of the SDK. This is only used by Gradle.
-# For customization when using a Version Control System, please read the
-# header note.
-#Sat Jul 07 20:57:43 CEST 2018
-sdk.dir=D\:\\Android\\SDK
+## This file must *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+#
+# Location of the SDK. This is only used by Gradle.
+# For customization when using a Version Control System, please read the
+# header note.
+#Sun Nov 11 16:49:15 CET 2018
+sdk.dir=/home/thore/Android/Sdk