Cisco Router IOS Upgrade

I know the process for upgrading a Cisco router is very well documented, so this is just so I can find it next time without having to search the Internet.

From the router type:

config t

copy tftp: flash:

Then, enter the tftp server's IP Address when requested [10.0.0.1] without brackets

Enter the IOS binary name when requested [c3640-ik9o3s-mz.124-25d.bin] without brackets

File will copy and will probably ask to erase flash. I say ok, with the knowledge the existing image will be deleted. I'm ok with that, so I confirm it.

The image is copied to the router's flash memory.

Now I want to verify the image's integrity so I type the following command:

verify flash:c3640-ik9o3s-mz.124-25d.bin

As long as the image is ok, then I set the router system boot:

boot system flash:c3640-ik9o3s-mz.124-25d.bin

Then I save the configuration:

wr mem

Finally, I reload the router:

reload

Finished.