@stormjaguar Good day. Sorry for the delay. Please refer to this link to find the suitable firmware: https://www.tp-link.com/th/support/download/archer-mr400/#Firmware and how to update the firmware:...

@Moonice Good day. May I know the hardware version of your TL-MR6400? If you are V3 and above, please try to set up QoS on the router; (but it could not limit the internet bandwidth of a specific...

@superuser Good day. Sorry for the delay. Did you still have the same issue: no sim card detected but internet working fine? If yes, we would like to forward your case to our senior engineers for...

@ThirumalaiK Hi, sorry for the delay. Firmware has been sent to the message box. Sorry for the inconvenience. Thank you very much for your understanding and support.

@teni Good day. Thank you very much for your time and patience. For your case, the issue is no sim card and also no internet service, not no sim card detected even though the internet is working...

@Mokoro Good day. Sorry for the delay. How long have you had the router and when did the issue start? If possible, could you please share a video clip here? Have you tried to reset the router by...