tplinkwifi.net : Why fail to access tplinkwifi.net Page?

Before the firmware update process, users are being recommended to read release notes of the firmware to know the configuration settings that will get removed or features which get upgraded during the process. To save yourself from reconfiguring the router, you can create a backup of the configuration settings that will get removed during the process. You can restore those settings later after the update process using the tplinkwifi.net window.