If you have a zappi v1 then there is no need to do anything. Your zappi will continue to work as it does now.
Warning: The original zappi v1 cannot be updated to the latest v5 firmware. If you plan to add another myenergi device to your network (an eddi, zappi v2 or libbi) then please get in touch with us at support@myenergi.com so we can discuss the options for upgrading your existing zappi to a newer version.