@Joohyun If only some webpages cannot be loaded, we don't suggest you disable the WMM. Can we confirm who is your ISP? Is it possible to connect a computer directly to the ISP modem, then check those...

@Slyguns Are you talking about Facebook Wi-Fi? Only Archer C50 supports it: https://www.tp-link.com/support/faq/2298/

@SanjitK You may stay with the latest firmware provided by the local service center, monitor the connectivity, then report back to the community or email if the issue is resolved or not. Just to...

@AnilCH Great. Enjoy the internet.

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

@kensden Are you able to login to its web management page via the domain http://tplinkmifi.net? Check this guide: https://www.tp-link.com/support/faq/1647/. If you can access its web management page...