@Minttus What is the led status of the Archer MR400? Can other devices access internet from the MR400? With smart TV connected to the TP-Link wifi, please ensure that it has obtained valid IP address...

@rinodb Is it still VDSL connection or ethernet connection? If it is still connected by VDSL line, you can configure it as the normal VDSL modem router. And the you can choose other for ISP, it does...

@Kvp To configure the Archer A9 as a secondary router as DHCP enabled, you only need to hard reset it by holding the reset button/hole for 10s with it powered on. And connect the WAN port of A9 to...

@DrRZ Try to disable the firewall on the clients and C9. Then try to ping the local device. Besides, have you ever enabled remote management on C9? Any updates, be free to let us know.

@AsifEmon When it failed to reconnect to the internet and shows red, please log into the web UI and check whether it has valid internet IP address and gateway. In the meantime, connect your computer...

@DjVirusPL Hi, it is not a fake router, it is still a TP-Link router, which is sold in the mainland of China. That is why you see that the menu is in Chinese. May I know where did you buy this...