@Jarax Can we confirm which firmware are you running on the C80, do you remember that? You can downgrade to the Archer C80(EU)_V1_210128, but you cannot downgrade to the previous Archer...

@TomGuerrero Which device are you referring to? Please tell us the model number, you can find it on its bottom sticker. How far between the two houses? If it is too far away, you may look for some...

@Jubairul99 TL-MR3420 v5 should be compatible with the Tether app. Just ensure you are running the latest Tether app, and the firmware of the MR3420 is up-to-date. Just to confirm, what is the phone...

@3rik Can you make it clearer that how are the devices connected? Except for the AX73, SG108E and SG105E, how many others are connected to the network? Is AX73 the main router and gateway? How about...

@Kelly-anne Below is a setup video for your reference to install your wireless router: https://www.tp-link.com/support/setup-video/ But if you still failed, please refer to the troubleshooting...

@Amerindianchief I assume setting the Parental Control on the Wi-Fi router will meet your requirements. Check this article to confirm: https://www.tp-link.com/support/faq/2386/