Hi @6153229 ,
You may try to perform a factory reset on the modem/router, as it will automatically reconfigure itself. Then, once the internet is re-established, follow the article below. This will guide you through troubleshooting steps on how to change the Wi-Fi password.
Changing your WiFi password on your TPG Modem
Regards,
The ownership of TP link was transferred to my name and want to know how the password is resetted
