diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 89393db..5219a02 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -26,6 +26,7 @@
           android:versionCode="230"
           android:versionName="2.3.0RC">
 
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
diff --git a/app/src/main/java/org/ocs/android/agent/activity/OCSAgentActivity.java b/app/src/main/java/org/ocs/android/agent/activity/OCSAgentActivity.java
index fd4fd9b..202b981 100644
--- a/app/src/main/java/org/ocs/android/agent/activity/OCSAgentActivity.java
+++ b/app/src/main/java/org/ocs/android/agent/activity/OCSAgentActivity.java
@@ -20,12 +20,12 @@
  */
 package org.ocs.android.agent.activity;
 
-import android.Manifest;
 import android.app.ProgressDialog;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
 import android.preference.PreferenceManager;
@@ -40,7 +40,6 @@
 import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;
-
 import org.ocs.android.actions.OCSProtocol;
 import org.ocs.android.actions.OCSSettings;
 import org.ocs.android.actions.PrefsParser;
@@ -48,11 +47,12 @@
 import org.ocs.android.agent.AboutDialog;
 import org.ocs.android.agent.AsyncOperations;
 import org.ocs.android.agent.R;
-
 import java.io.File;
 import java.io.IOException;
 import java.text.SimpleDateFormat;
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.List;
 import java.util.Locale;
 
 /**
@@ -63,24 +63,13 @@ public class OCSAgentActivity extends AppCompatActivity implements ActivityCompa
     private final static String IMPORT_CONFIG = "import_config";
     protected ProgressDialog mProgressDialog;
 
-    //ID to identify a camera permission request.
-    private static final int PERMISSIONS_REQUEST_CAMERA = 1;
-    private static final int PERMISSIONS_REQUEST_EXTERNAL_STORAGE= 2;
-    private static final int PERMISSIONS_REQUEST_PHONE_STATE= 3;
-
+    private static final int REQUEST_PERMISSION_CODE = 1;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.ocs_agent);
 
-        String[] permissionName = {Manifest.permission.CAMERA,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.READ_PHONE_STATE};
-        int[]  permissionRequest = {PERMISSIONS_REQUEST_CAMERA,PERMISSIONS_REQUEST_EXTERNAL_STORAGE,PERMISSIONS_REQUEST_PHONE_STATE};
-
-        for(int i=0; i<permissionName.length; i++){
-            this.requestPermissions(permissionName[i], permissionRequest[i]);
-        }
-
         // Initialize configuration.
         // If an extra "IMPORT_CONFIG" is added on launch of the activity, the configuration will be imported
         settings = OCSSettings.getInstance(this);
@@ -107,7 +96,7 @@ protected void onCreate(Bundle savedInstanceState) {
         new OCSProtocol(getApplicationContext()).verifyNewVersion(vcode);
 
 
-        /**
+        /*
          * Actions for buttons
          */
         // Send Inventory
@@ -136,45 +125,38 @@ public void onClick(View v) {
                 spawnTask(false);
             }
         });
-    }
 
-    @Override
-    public void onRequestPermissionsResult(int requestCode,
-                                           String permissions[], int[] grantResults) {
-        switch (requestCode) {
-            case PERMISSIONS_REQUEST_CAMERA: {
-                // If request is cancelled, the result arrays are empty.
-                if (grantResults.length > 0
-                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    // permission was granted, yay!
-                } else {
-                    // permission denied, boo! Disable the
-                    // functionality that depends on this permission.
+        // Check permissions
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            String[] ocsPermissions = new String[]{
+                    android.Manifest.permission.READ_EXTERNAL_STORAGE,
+                    android.Manifest.permission.CAMERA,
+                    android.Manifest.permission.READ_PHONE_STATE};
+
+            List<String> permissionNeeded = new ArrayList<>();
+            for (String permission:ocsPermissions) {
+                if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED){
+                    permissionNeeded.add(permission);
                 }
-                return;
             }
-            case PERMISSIONS_REQUEST_EXTERNAL_STORAGE:{
-                // If request is cancelled, the result arrays are empty.
-                if (grantResults.length > 0
-                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    // permission was granted, yay!
-                } else {
-                    // permission denied, boo! Disable the
-                    // functionality that depends on this permission.
-                }
-                return;
+            if (!permissionNeeded.isEmpty()) {
+                requestPermissions(permissionNeeded.toArray(new String[permissionNeeded.size()]), REQUEST_PERMISSION_CODE);
             }
-            case PERMISSIONS_REQUEST_PHONE_STATE:{
-                // If request is cancelled, the result arrays are empty.
+        }
+    }
+
+    @Override
+    public void onRequestPermissionsResult(
+            int requestCode,
+            String permissions[],
+            int[] grantResults) {
+        switch (requestCode) {
+            case REQUEST_PERMISSION_CODE:
                 if (grantResults.length > 0
-                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    // permission was granted, yay!
-                } else {
-                    // permission denied, boo! Disable the
-                    // functionality that depends on this permission.
+                        && grantResults[0] == PackageManager.PERMISSION_DENIED) {
+                    Toast.makeText(this, getResources().getString(R.string.must_accept_permissions) , Toast.LENGTH_SHORT).show();
                 }
-                return;
-            }
+                break;
         }
     }
 
@@ -278,15 +260,7 @@ private void setStatus(String msg) {
         status.setText(msg);
     }
 
-    private void requestPermissions(String permissionName, int permissionRequest){
-        //request permission.
-        if (ContextCompat.checkSelfPermission(OCSAgentActivity.this, permissionName)
-                != PackageManager.PERMISSION_GRANTED) {
-
-            // No explanation needed, we can request the permission.
-            ActivityCompat.requestPermissions(OCSAgentActivity.this,
-                    new String[]{permissionName},
-                    permissionRequest);
-        }
+    private  void checkAndRequestPermissions() {
     }
+
 }
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 7f7aca9..242facd 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -59,5 +59,6 @@
     <string name="pref_title_compua">Useragent Vereinbarkeit</string>
     <string name="title_activity_ocslaunch">Installation</string>
     <string name="start_download_service">Starten des Update-Service</string>
+    <string name="must_accept_permissions">Sie müssen alle Berechtigungen akzeptieren</string>
 
 </resources>
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index 6c19c6e..2778c8b 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -56,5 +56,6 @@
     <string name="pref_description_syshide">Ne pas inclure les logiciels systèmes</string>
     <string name="title_activity_ocslaunch">Installation</string>
     <string name="start_download_service">Lancement du service d\'update</string>
+    <string name="must_accept_permissions">Vous devez accepter toutes les permissions</string>
 
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 7c93ea4..f60bee8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -50,5 +50,6 @@
     <string name="title_activity_ocslaunch">Installation</string>
     <string name="err_cant_connect">Unable to connect to : </string>
     <string name="start_download_service">Start package update service</string>
+    <string name="must_accept_permissions">You must accept all permissions</string>
 
 </resources>
\ No newline at end of file