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Hi @peterpayne . Just to be clear, are you connecting the BE65 directly to NBN box, or using the BE65 as secondary router connected to one of the other routers?
With BE65 connected to NBN box, have you done the IPTV/VLAN setup?
Does the BE65 have an option for IPv4 or IPv6? Only IPv4 is used with TPG.
@peterpayne . What is the colour of the BE65 indicator light?
Since the X20 works with its settings, you should ask TP-Link how to get the BE65 working with the same settings. Don't bother mentioning the VR1600 because they will disown it because it has modified firmware.
@peterpayne . Hard red means Deco has an issue, whatever that means. Is there an internal fault or inconsistent settings? Have you tried factory reset?
What sorts of things did TP-Link say?
Turn NBN box and BE65 off, connect them, then turn both on.