What I changed is the Wi-Fi router. I used same devices to test.

Hi, I checked with some Wi-Fi monitor apps on my Android phone. It showed both 5G channels width were only 40Mhz. Connection speed is only 400Mbps max on all my laptops and phones. They could connect...

Posted a question about SETTING up Archer C4000 yesterday but that post disappeared.... 😅 Is there a way to fix the channel width to 80Mhz for the 2 5Ghz channels? Enable Smart Connect but they...

My router is a Archer C4000. No matter how I set up the Wi-Fi, it can only run at 40Mhz channel width. I tried auto or fix it at 80Mhz. It only runs at 40Mhz. I tried Smart Connect but didn't help....