@josephkhan What are the model number of these smart home devices? Can you turn the smart plugs on or off remotely via the kasa app? Besides, is there any error message that they do not response? You...

@MiniYNWA Thanks for your reply, glad to hear that it works well now. You can enjoy the internet with the 2 routers. Best regards.

@aloxaz Thanks for your reply. What is the IP and gateway obtained by the Android box when it failed to get internet from Archer C20i? At that time can it ping the gateway of the TP-Link router? Try...

@lemon Noted that. Best regards.

@David.1983 Thanks for your reply, glad to hear that you figured it out by flashing back to OpenWRT. Congrats. The reason why it stops working when use the stock firmware is still a misery, but it...

@mboekhold Please connect your computer to the modem/internet source directly and setup the PPPoE connection. Instruction as below, here we take Windows 10 as example....