Hi @vgeorgas ,
Thanks for raising this to us. If the modem/router can get a solid DSL light this means it is now connected to the network however since a Factory Reset was done you may need to reconfigure or re-enter the TPG Username/Password on the modem's user interface settings.
Here is a list of guide that you may find helpful.
We also did an articles that you may find helpful on connection to the Wi-Fi.
Retrieving Wi-Fi Password on TPG Modems
Let us know how it will go and should you require further assistance.