I have bought this mode after change to ultrafast plan. And fortunately, I have been able to make this work by update firmware to 1.10 and use it as extended with old existing modern.  http://support.dlink.com.au/Download/download.aspx?product=DIR-X5460 Download the firmware and upgrade manually in router settings. (the auto update feature is not working)   Reboot the modern or you may need to use factory reset until you see "the operation mode".   Change it to extended mode and wait for modern to finish procceed. Then you will need to use the another ethernet cable(this come along with modern) and connect to Slot1 of old modern and Slot1 of DIR-X5460. Finally, you need to log back to settings and change extender settings using ethernet rather than wifi to use max capacity. However, I will not recommend this mode for TPG because of faulty settings and you will need to reuse the old modern for it to work. I hope this method will help people who already bought it from recommendation of tpg ultrafast plan. Cheers.   ... View more