How to download sqlite database file and save in android device

I'm trying to download sqlite's .db file and replace it in my android device. Although i manage to download the file, it seems that the file size is not a match and when i try to open with sqliteman program it says this error: "Unable to open or create file test-sqlite5.db. It is probably not a database.". I suspect its due to charset issue because there area a lot of weird characters inside the .db file and probably when it is being downloaded, it is converted into some different characters? I've tried to use "UTF-8" and "UTF-16" but with same problem. Following is my code.

        HttpGet request = new HttpGet();
        request.setURI(new URI(url));
        HttpResponse response = client.execute(request);



        String line = "";

        File f = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "test-sqlite5.db");
        FileOutputStream fos = new FileOutputStream(f);

        StringBuilder total = new StringBuilder();
        // Wrap a BufferedReader around the InputStream
        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
        // Read response until the end
        try
        {
            while ((line = rd.readLine()) != null)
            {
                total.append(line);
            }
        } catch (IOException e)
        {
            Log.e(t, "error build string" + e.getMessage());
        }


        fos.write(total.toString().getBytes());
        fos.close();