Look on the back or bottom for a label that will look similar to this: You can then visit the manufacturer’s website and download the latest firmware for your router model and version. You login by typing the URL of the router into your web browser. You will need to enter your router’s username and password.
If you never supplied a username and password, check the manufacturer’s website for default passwords that might work.
Your computer will act as a server and the Cisco router will act as a client.
Configure the directory for outbound files as per the instructions for the TFTP server you downloaded. Select an IOS image from the Cisco customer site and download it to your TFTP server's outbound directory.
Your router has a firmware chip on it similar to your computer’s BIOS.
Once you’ve done that you should see a screen confirming that your trainer is running the latest firmware.
Because Cisco Linksys are the most common home router, this article shows the process on a Cisco E4200 wireless router. Keeping the router up-to-date is just as important as keeping your system’s hardware and software current.
Remember each router is different, but upgrading the firmware is essentially the same process. Now that you’re logged into the router, view the firmware version currently on the router. Visit the Cisco Linksys support site and select you router’s model to see if there is an updated version. Make sure not to do anything else on your computer while the process is active. You won’t be able to access the Internet or network while it’s rebooting.
You will have one of the options we talked about before–either Browse to the file you downloaded from the manufacturer to your computer.
Or tell the router to check for firmware updates itself.