Open your browser and enter the IP address of your wireless router.
In our example, the following URL was entered in the Browser:
The AC1200 web interface should be presented.
On the login screen, enter the management password.
Access the Advanced tab on the top of the screen.
Access the WIRELESS menu and select the WIRELESS SETTINGS option.
On the Wireless settings screen, uncheck the Smart connect option and select the 5GHz option.
To disable the 5GHz band, uncheck the option named Enable Wireless radio.
Congratulations, you have disabled the 5GHz wireless band on the AC1200 router.