If your Tp-link router supports the Tp-link cloud service, you can automatically update the firmware in your device. A notification will appear on the main page of your tplinkwifi.net interface, if there is any new firmware available for your Tp-link router. You just have to click on the Update option to initialize the firmware update process for your router. Wait for a few minutes and make sure you do not cause any interruption during an update process, it may bring failure in the firmware update of your Tp-link router.