Well, if any of you have the same problem, pls follow the steps below:
1. make sure you have registered your tool online in our site. Try to log in our site in webpage to make sure the ID and password are all correct.
2. Load the SD card to your computer by a card reader.
3. Download the PC SUIT for DS708 in your account then install it in your computer.
4. Log in our server thru PC SUIT. You will get a message "authorization is done" so some alike, which means our server has recognized your tool.
5. Insert the card back to your DS708. Done. The unregistered message will not show up.