@lule If you want to connect the TL-WA830RE to the TL-PA4010 by wired cable to boost wifi signal, you need configure the TL-WA830RE as an access point. What is the hardware version of TL-WA830RE? As...

@Gogetz Hi, we have confirmed that this Deco M4 with 20191102 supports web interface. You can connect your computer to it and try to access it with the domain name, which is tplinkdeco.net. Good day.

@Makis Thanks for the information provided. We would like to follow up on your case via email to do further analysis. If it is okay for you, please check your inbox and get in touch with us. Good day.

@Tutuka28 What about other devices connected to the main router? Do they lose internet connection? What is the led status of the TL-WA850RE when it stops working? Are you able to access internet from...

@MikhailB Yep, you can refer to the picture attached below as well.

@Prope What is the model number of the Mikrotik router? You can show us a screenshot of the back label of the actual device. Try to log into the web UI and show us a screenshot of the 2.4GHz wireless...