Dear, Thanks for your reply! I had tried to connect my phone using xs++ and setool2lite v.1.11, but my phone still has no response.

When I used xs++, I hold "c" and connected the usb cable. It showed the following in the log window:

------------
10:57:46| XS++ v3.1 (Darwin) Ready !
10:57:46| Executed on Microsoft Windows XP
10:57:52|
10:57:52| Attempting to open the interface...
10:57:52|
10:57:52| TURN OFF PHONE!
10:57:52| Hold 'C' button on phone and connect phone NOW.
10:57:52| You have 30 seconds...
10:57:52|
10:58:28| Error: Cannot open phone communication port
10:58:30| Disconnected... Unplug the phone
------------

When I used Setool2Lite v.1.11, it just kept running no response so I had to manually stopped the detection.

------------------
Abort all operations.
phone pre-boot failed, possible RECOVERY needed.
Elapsed: 195 secs.
------------------

What else can I do now? In the mean while, I will keep trying! Thanks again!!!