Open a web browser and sign in to your router’s admin page (check the router label for the address, or use the IP gateway from your device)
Log in with your router admin username and password
Find the wireless settings section (often labeled Wireless, Wi‑Fi, WLAN, or Advanced Wireless)
Select the band to change (2.4 GHz, 5 GHz, or both)
Locate the option for Channel or Channel Selection Mode
Set Channel Selection Mode to Manual (or disable Auto Channel)
Choose the desired Wi‑Fi channel from the Channel dropdown/list
Save/apply the changes
Reconnect devices to the Wi‑Fi network if needed
If performance issues occur, try another channel and repeat the process