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Hi @Jamesvanessa . What is the model of the old router and the new one?
What type of NBN connection do you have?
If you have an NBN box, what is the state of the indicator lights?
The settings are PPPoE, username and password. You may need to set VLAN ID.
@Jamesvanessa . Is the Optical light green?
When you connect either router to NBN box, does Alarm light go green?
Whar is the actual model of the new router, eg. VR1600 or VX220 or ...?
Did you get it from TPG or buy at store?
If from TPG, it should configure itself once connected. If it doesn't, you can do it yourself with the above settings.
VLAN ID should be Disabled for your FTTP connection.
Maybe do factory reset and start again.
@Jamesvanessa . The ip address and username and password to login to router are on the label on the router.
Since it is not a TPG provided router, you need to manually configure it to your NBN FTTP/H.
Use this article as a guide/reference: NBN Fibre To The Premise (NBN FTTP) Setup Guide
BasilDV