Model : TD-W8970

Hardware Version : Not Clear

Firmware Version : 3

ISP :

Hi,

I can access to web page of TD-W8970 v3 modem and this following is appears on browser :

Update Software

Step 1: Obtain an updated software image file from your ISP.

Step 2: Enter the path to the image file location in the box below or click the "Browse" button to locate the image file.

Step 3: Click the "Update Software" button once to upload the new image file.

NOTE: The update process takes about 2 minutes to complete, and your DSL Router will reboot.

Software File Name:

But after clicking that update button an error page is appears :

DSL Router Software Upgrade

Image uploading failed. The selected file contains an illegal image.

How to solve this trouble ?