diff --git a/brouter-routing-app/src/main/java/btools/routingapp/DownloadWorker.java b/brouter-routing-app/src/main/java/btools/routingapp/DownloadWorker.java
index 3453924..4d30402 100644
--- a/brouter-routing-app/src/main/java/btools/routingapp/DownloadWorker.java
+++ b/brouter-routing-app/src/main/java/btools/routingapp/DownloadWorker.java
@@ -287,10 +287,17 @@ public class DownloadWorker extends Worker {
           String profileLocation = mServerConfig.getProfilesUrl() + fileName;
           URL profileUrl = new URL(profileLocation);
           int size = (int) (profileFile.exists() ? profileFile.length() : 0);
-          downloadProgressListener.onDownloadStart(fileName, DownloadType.PROFILE);
-          downloadFile(profileUrl, profileFile, size, false, DownloadType.PROFILE);
-          downloadProgressListener.onDownloadFinished();
-          done.add(profileUrl);
+
+          try {
+            downloadProgressListener.onDownloadStart(fileName, DownloadType.PROFILE);
+            downloadFile(profileUrl, profileFile, size, false, DownloadType.PROFILE);
+            downloadProgressListener.onDownloadFinished();
+            done.add(profileUrl);
+          } catch (IOException e) {
+            // no need to block other updates
+          } catch (InterruptedException e) {
+            throw new RuntimeException(e.getMessage());
+          }
         }
       }
     }
diff --git a/brouter-routing-app/src/main/java/btools/routingapp/ServerConfig.java b/brouter-routing-app/src/main/java/btools/routingapp/ServerConfig.java
index 6f1c811..658b13e 100644
--- a/brouter-routing-app/src/main/java/btools/routingapp/ServerConfig.java
+++ b/brouter-routing-app/src/main/java/btools/routingapp/ServerConfig.java
@@ -1,13 +1,20 @@
 package btools.routingapp;
 
 import android.content.Context;
+import android.content.res.AssetManager;
 
 import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
+import java.io.InputStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
 
 public class ServerConfig {
+  private static String mServerConfigName = "serverconfig.txt";
+
   private String mSegmentUrl = "https://brouter.de/brouter/segments4/";
   private String mLookupsUrl = "https://brouter.de/brouter/profiles2/";
   private String mProfilesUrl = "https://brouter.de/brouter/profiles2/";
@@ -16,10 +23,19 @@ public class ServerConfig {
   private String[] mProfiles = new String[0];
 
   public ServerConfig(Context ctx) {
-    File configFile = new File(ConfigHelper.getBaseDir(ctx), "/brouter/segments4/serverconfig.txt");
-    if (configFile.exists()) {
+    File configFile = new File(ConfigHelper.getBaseDir(ctx), "/brouter/segments4/" + mServerConfigName);
+    readConfigFile(configFile);
+  }
+
+  public ServerConfig(Context context, File file) {
+    readConfigFile(file);
+  }
+
+  private void readConfigFile(File file) {
+    if (file.exists()) {
+      BufferedReader br = null;
       try {
-        BufferedReader br = new BufferedReader(new FileReader(configFile));
+        br = new BufferedReader(new FileReader(file));
         for (; ; ) {
           String line = br.readLine();
           if (line == null) break;
@@ -35,12 +51,85 @@ public class ServerConfig {
             mProfiles = line.substring(15).split(",");
           }
         }
-        br.close();
       } catch (IOException e) {
         e.printStackTrace();
+      } finally {
+        try {
+          if (br != null) br.close();
+        } catch (IOException e) {
+          throw new RuntimeException(e);
+        }
       }
 
     }
+
+  }
+
+  public static void checkForUpdate(Context context, File path, String assetZip) {
+    if (assetZip != null) {
+      writeTmpFromAsset(context, path, assetZip);
+
+      File configFileOld = new File(ConfigHelper.getBaseDir(context), "/brouter/segments4/" + mServerConfigName);
+      File configFileNew = new File(ConfigHelper.getBaseDir(context), "/brouter/segments4/" + mServerConfigName + ".tmp");
+      if (configFileOld.length() != configFileNew.length()) {
+        ServerConfig serverConfigOld = new ServerConfig(context, configFileOld);
+        ServerConfig serverConfigNew = new ServerConfig(context, configFileNew);
+        if (serverConfigOld.getSegmentUrl().equals(serverConfigNew.getSegmentUrl()) &&
+          serverConfigOld.getProfilesUrl().equals(serverConfigNew.getProfilesUrl()) &&
+          serverConfigOld.getLookupUrl().equals(serverConfigNew.getLookupUrl())
+        ) {
+          // replace when servers wasn't changed
+          configFileOld.delete();
+          configFileNew.renameTo(configFileOld);
+        }
+      } else {
+        configFileNew.delete();
+      }
+    }
+  }
+
+  private static void writeTmpFromAsset(Context context, File path, String assetZip) {
+    InputStream is = null;
+    try {
+      AssetManager assetManager = context.getAssets();
+      is = assetManager.open(assetZip);
+      ZipInputStream zis = new ZipInputStream(is);
+      byte[] data = new byte[1024];
+      for (; ; ) {
+        ZipEntry ze = zis.getNextEntry();
+        if (ze == null)
+          break;
+        if (ze.isDirectory()) {
+          continue;
+        }
+        String name = ze.getName();
+        if (name.equals(mServerConfigName)) {
+          File outfile = new File(path, name + ".tmp");
+          if (!outfile.exists() && outfile.getParentFile() != null) {
+            outfile.getParentFile().mkdirs();
+            FileOutputStream fos = new FileOutputStream(outfile);
+
+            for (; ; ) {
+              int len = zis.read(data, 0, 1024);
+              if (len < 0)
+                break;
+              fos.write(data, 0, len);
+            }
+            fos.close();
+          }
+        }
+        zis.closeEntry();
+      }
+      zis.close();
+    } catch (IOException io) {
+      throw new RuntimeException("error expanding " + assetZip + ": " + io);
+    } finally {
+      try {
+        if (is != null) is.close();
+      } catch (IOException e) {
+        throw new RuntimeException(e);
+      }
+    }
   }
 
   public String getSegmentUrl() {