If you bypass the router and connect direct to the modem via wire, what speeds do you get? Also try different cables as sometimes they can affect speed.

If it is not working, use your warranty. Do not open it as that may make your warranty invalid. Try the 30/30/30 reset...

You are correct. Limit would be 100. https://www.tp-link.com/la/home-networking/wifi-router/archer-c60/#specifications

1) https://www.tp-link.com/bg/support/download/archer-c5-v4/ assuming region and language. 2) TP-Link changed the user interface (UI) one is green and the other is Blue (older). They are different so...

Did you update the firmware at some point? On my Archer C8, port forwarding does not work with the latest firmware version so I dropped back to an older version. The User Interface was different in...

What formats are the USB drives as TP-Link does not work with some formats such as the Apple formats.