@Pradipta Please refer to this guide to do a firmware recovery via the web interface: https://www.tp-link.com/support/faq/1482/ If this still doesn't help, you can try the suggestions provided by...

@popsslu I think the new official firmware is still under testing, please pay attention to the new release on the router web GUI or Tether app.

@Anurag7108 What is the device and model of the adapter that connected to the LAN port of the Archer AX20? Have you tried to connect other devices with a gigabit Ethernet port to one of the LAN ports...

@Dawnrazor Do let the community know if there is any insight from your ISP.

@Rangel_Stavrev We have reported the issue to the support engineers, they will likely reach out to you via email to continue to troubleshoot your issue.

@beck2021 We confirm this is a customized version for MYDigi, so you cannot upgrade to the generic version.