Please connect an Ethernet cable from your existing router/network in to the port labelled "Internet" on the back of the Buffalo.
Then connect an Ethernet cable between port 1 on the back of the Buffalo and your computer
Turn on the router and wait for a few minutes
Open a web browser and type http://192.168.10.1 in to the address bar
You will be prompted to log-in. The default username is "admin" and the password is "admin" (unless you have changed these).
Click on "Administration" on the left menu
Click on "Firmware Upgrade" on the left menu
Click "Browse" and select the firmware file that you have been provided
Be sure to set the "After flashing, reset to" option to "Reset to Default Settings"
Click on "Upgrade".
The upgrade process will now begin and take up to 5 minutes to complete, and reboot