diff --git a/app/src/main/java/io/github/otaupdater/otaupdater/activity/MainActivity.java b/app/src/main/java/io/github/otaupdater/otaupdater/activity/MainActivity.java
index c74c6ee..eb3f741 100644
--- a/app/src/main/java/io/github/otaupdater/otaupdater/activity/MainActivity.java
+++ b/app/src/main/java/io/github/otaupdater/otaupdater/activity/MainActivity.java
@@ -1,6 +1,7 @@
 package io.github.otaupdater.otaupdater.activity;
 
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentTransaction;
@@ -8,17 +9,21 @@
 import android.view.View;
 import android.widget.Button;
 
-import io.github.otaupdater.otaupdater.util.Config;
 import io.github.otaupdater.otaupdater.R;
 import io.github.otaupdater.otaupdater.fragment.GithubReleasesFragment;
+import io.github.otaupdater.otaupdater.util.Config;
 
 public class MainActivity extends AppCompatActivity {
     private GithubReleasesFragment mFragmentOldRelease;
     private Button mCheckUpdate;
+    private SharedPreferences settings;
+    private SharedPreferences.Editor editor;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        PutStringPreferences("version", Config.getRomInstalledVersion());
         this.mFragmentOldRelease = new GithubReleasesFragment().setTargetURL(Config.URL_OLD_RELEASES());
         updateFragment(mFragmentOldRelease);
         mCheckUpdate=(Button)findViewById(R.id.activity_main_check_for_update);
@@ -37,5 +42,12 @@ protected void updateFragment(Fragment fragment)
         ft.replace(R.id.content_frame, fragment);
         ft.commit();
     }
+    public void PutStringPreferences(String Name,String Function){
+        settings = getSharedPreferences(Name, 0); // 1 - for public mode
+        editor = settings.edit();
+        editor.putString(Name, Function);
+        editor.commit();
+
+    }
 }
 
diff --git a/app/src/main/java/io/github/otaupdater/otaupdater/util/Config.java b/app/src/main/java/io/github/otaupdater/otaupdater/util/Config.java
index 6a688ea..41e9f36 100644
--- a/app/src/main/java/io/github/otaupdater/otaupdater/util/Config.java
+++ b/app/src/main/java/io/github/otaupdater/otaupdater/util/Config.java
@@ -85,11 +85,26 @@ public static void Downloader(Context c){
         Long reference = downloadManager.enqueue(request);
 
     }
+    static String getRomVersion() {
+        String version;
+        version=ShellExecuter.runAsRoot("getprop ro.rom.version");
+        return version;
+    }
 
     public static String getRomInstalledVersion() {
         String version;
-        version=ShellExecuter.runAsRoot("getprop ro.rom.version");
+        if(!isVersionValid(getRomVersion()))
+        {
+            version="20161220";
+            Log.e(Tag,"no version found in build.prop using default "+ version  );
+        }
+        else {
+            version=getRomVersion();
+        }
         return version;
     }
+    public static boolean isVersionValid(String version) {
+        return version.length() > 2;
+    }
 
 }