To download firmware for the Huawei B311-221 (also known as the B311s-221), the most reliable and secure method is through the router's internal update system or the official Huawei support channels. Official Update Methods
Access the Web UI: Open a browser and enter 192.168.8.1 (the default IP; check the sticker on the bottom of your device to confirm). huawei b311221 firmware download link
Before you start:
Connect your computer or phone to the router's Wi-Fi network. Open a browser and enter 192.168.8.1 in the address bar. To download firmware for the Huawei B311-221 (also
Huawei B311-221 Firmware Download Guide