@hass_m , Thank you for posting in the TP-Link community. We haven't received any information about adding DoH/DoT functionality to DSL modems yet. However, I will note this suggestion and pass it on...

@siamhossain , It is also the official firmware, no worry.

Hi @Retro_0223 , Please don't worry, it's likely related to the changes in version 1.5.11. I will get back to you if there are any updates.

@ismailakarim , Thanks for contacting our community. Would you mind providing more details about NAT SECURITY? In other words, what changes would you like to see?

Hello @Dennis095 , Welcome to our community. First, please ensure everything is configured correctly: Connect the DSL cable to the DSL port on your TP-Link modem router. Wait for the DSL LED to start...

Hello @ramosmg , Thank you for posting on the TP-Link community. AX5400 typically refers to the Wi-Fi specification of a router. If you bought the router recently, you can replace it with Archer...