diff --git a/common/src/main/java/com/xypower/common/FileDownloader.java b/common/src/main/java/com/xypower/common/FileDownloader.java
index d781fe14..cda9054e 100644
--- a/common/src/main/java/com/xypower/common/FileDownloader.java
+++ b/common/src/main/java/com/xypower/common/FileDownloader.java
@@ -22,17 +22,19 @@ public class FileDownloader {
             return false;
         HttpURLConnection connection = null;
         GZIPInputStream gZIPInputStream = null;
+        InputStream is = null;
+        OutputStream os = null;
         boolean res = false;
+
         try {
             Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
             URL url = new URL(urlString);
             connection = (HttpURLConnection) url.openConnection();
-            // connection.setRequestProperty("Accept-Encoding", "gzip");
+            connection.setRequestProperty("Accept-Encoding", "gzip");
             connection.setConnectTimeout(5000);
             connection.setReadTimeout(60000);
             connection.setDoInput(true);
-            String encoding = connection.getContentEncoding();
-            InputStream is = connection.getInputStream();
+            connection.connect();
             final File temp = new File(filePath);
             if (temp.exists())
                 temp.delete();
@@ -41,30 +43,37 @@ public class FileDownloader {
             temp.setWritable(true, false);
             downloadFile = temp;
             Log.d("download", "url " + urlString + "\n save to " + temp);
-            OutputStream os = new FileOutputStream(temp);
+            os = new FileOutputStream(temp);
+
+            String encoding = connection.getContentEncoding();
+            is = connection.getInputStream();
+
             byte[] buf = new byte[8 * 1024];
+
+            if(encoding.equals("gzip")) {
+                gZIPInputStream = new GZIPInputStream(is);
+                is = gZIPInputStream;
+            }
             int len;
             try {
                 while ((len = is.read(buf)) != -1) {
                     os.write(buf, 0, len);
                 }
                 os.flush();
-                if (os instanceof FileOutputStream) {
-                    ((FileOutputStream) os).getFD().sync();
-                }
                 res = true;
+            }catch(Exception ex) {
+                ex.printStackTrace();
             } finally {
-                closeSilently(os);
-                closeSilently(is);
             }
-            Log.d("downloadAPK", "download complete url=" + urlString + ", fileSize= " + temp.length());
-//			installPkg(this, temp, pkg);
+            // Log.d("Download", "download complete url=" + urlString + ", fileSize= " + temp.length());
         } catch (Exception e) {
-            Log.w("downloadAPK", e);
+            // Log.w("downloadAPK", e);
             if (downloadFile != null)
                 downloadFile.delete();
-
+            e.printStackTrace();
         } finally {
+            closeSilently(os);
+            closeSilently(is);
             if (connection != null)
                 connection.disconnect();
         }
@@ -72,8 +81,6 @@ public class FileDownloader {
         return res;
     }
 
-
-
     public static final void closeSilently(Object closeable) {
         try {
             if (closeable != null) {
diff --git a/common/src/main/java/com/xypower/common/FileUtils.java b/common/src/main/java/com/xypower/common/FileUtils.java
new file mode 100644
index 00000000..6664ce0a
--- /dev/null
+++ b/common/src/main/java/com/xypower/common/FileUtils.java
@@ -0,0 +1,42 @@
+package com.xypower.common;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+public class FileUtils {
+
+
+
+
+    public static boolean DeleteFilesInPath(String path, long seconds) {
+        File pathFile = new File(path);
+        if (!pathFile.exists() || !pathFile.isDirectory()) {
+            return false;
+        }
+
+        long ts = System.currentTimeMillis();
+        long diff = 0;
+        seconds *= 1000;
+
+        List<File> files = new ArrayList<File>();
+
+        for (File f : pathFile.listFiles()) {
+            if (!f.isFile()) {
+                continue;
+            }
+            diff = ts - f.lastModified();
+            if (diff > seconds) {
+                files.add(f);
+            }
+        }
+
+        for (File f : files) {
+            f.delete();
+        }
+
+        return true;
+    }
+
+}