Worst thing happened yesterday while I was updating my router(WGR614v9
54 Mbps Wireless Router) firmware. Usually updating the firmware is an easy process. All you have to do is log in to the router via any web browser and upload the latest firmware file. In my case I did manage to upload the file but when the router restarted the power button started blinking. The blinking power button indicates that the firmware is corrupt.

In such a situation only way to save the router is to transfer the firmware file through router’s built-in TFTP server. If you are comfortable with the Terminal.app the process is really easy. Here are the steps.

• Fire-up the Terminal.app (/Applications/Utilities/Terminal.app).
• cd to the location where the firmware file (with .chk extension) is located.
• Issue the following commands and hit return
tftp -e <ip address of your router>

(Command to connect to the tftp server)

put <firmware filename>

(Copy the firmware file from the local machine to the server)

quit

(Quit the tftp connection)
This method worked well with my router. However there may be different ways to transfer the file with other brands.