@Shuvro00 Hi, thanks for posting question on our community. May I confirm that the 2.4Ghz network stopped working totally? Is the 2.4Ghz wifi LED still on? Please take factory reset and reconfigure...

@T-Peter Hi Peter, thanks for posting question on our community. As I know, Archer C9 does not support WireGuard protocol. If your wireless and wired clients can connect to the router and work, it is...

@Aamir120 Hi，thanks for posting question on our community. If you are only seeing the 2.4GHz network (TP-Link_XXXX), not 5GHz network (TP-Link_XXXX_5G), please disable the "Smart Connect" feature....

@SNCU Hi,thanks for posting question here. Do you mean that you failed to log into the web interface of the router? Can you get internet access on other devices? You may refer to this thread.

@RobCon It's OK. And yes. Common wireless routers which support wireless router and Access point mode for your reference: Wi-Fi Routers Find the Router for You

@Marvin_S Hi, did you fix the issue?