Hi, Who is your internet service provider? On the back of the TL-WR840N, is the blue port connected to your modem? What's the firmware and hardware version of the TL-WR840N? Is the internet light...

On the Archer C5 V4, there is no Access Point mode which you can select. However, you can refer to the link below to configure the Archer C5 to work as a AP. https://www.tp-link.com/en/faq-1199.html

Would you please describe your requirements on the parental control in details, and send me the screenshot of the settings on the parental control, so that I can confirm whether your settings are...

The TP-LINK VDSL modem router is no problem to work with the deco system.

The C3150 is not a 3G/4G router, it can't work with the USB modem, and can't enable second WAN connection.

Have you tried change the channel and channel width on the modem? If not, you can have a try. https://www.tp-link.com/en/faq-474.html What's the firmware and hardware version of your modem? If your...