@AlanHockey Here's a video guide setup for your RE. Once you use its network security key for login it should be remembered by the client device.

@Tnx- For this information you have to check the support page regularly for any updated FW release - here's an official answer from TP-Link.

@MikeDixonN4 Try resetting the rear cameras and setting them up from scratch once you already have the RE up and running in your network. If the issue persists set the extended wireless network SSID...

@JPC17 You're probably have to use this guide to configure your modem for NBN. Your modem probably has a customized FW if it has been provided by the ISP. If that's the case it's quite possible that...

@Mahab You have to use the router reset button - press that button while the router is powered on for about 10 seconds. After a successful reset you have to re-configure the device from scratch.

@akb_here What make and model are Switch0 and Switch1 ? Do you have any DHCP server configuration on the Switch0 ?