1) Press the "Firmware Update" link to download to your PC the latest available firmware for your router.
2) Disconnect your PC from the internet.
3) Connect your PC to the LAN port of the router and log into the web interface.
4) Navigate to Management -> 'Upgrade' and click 'Browse' in the 'Select file' field.
5) Navigate to the firmware file you downloaded in step 1 above and select it.
6) Click the 'Upgrade' button.
7) After the file is uploaded, the router will display the file's checksum and a confirmation message. Only proceed if the checksum of the uploaded file matches the expected value as listed on the firmware download page of the ReadyNet web site. If the checksum values don't match, return to the upload page and start over. If the checksum repeatedly fails, you may need to download the file from the ReadyNet web site.

8) Wait for the router to apply the firmware update. This will take several minutes, during which time the NET light may blink rapidly. Do not disconnect the router's power until the device reboots.

9) Once the firmware file has uploaded, the router will reboot and be running the new firmware.

Don't remove power to the router  while it is being flashed with new firmware and if using your laptop, make sure the battery does not run out.