If your modem does not support automatic updates, follow these general steps: How To Update Router Firmware

This guide uses the standard interface found on most Airtel routers (often Nokia or Sercomm models). Menus may vary slightly depending on your specific hardware version.

Open a web browser and enter your gateway IP address. Common defaults are 192.168.1.1 or 192.168.0.1 .

The new firmware reset your QoS or MTU settings to default, or it is re-optimizing the channel. Fix: Do not panic. Wait 1 hour. If still slow: