Some variants of the Huawei B311 support flashed custom firmwares like OpenWRT, which allows for advanced networking features, such as tailored VPN setups and better traffic management.
This occurs if the firmware file signature does not match your router's hardware sub-model or carrier restrictions. Huawei B311-221 Firmware
Resolving known software glitches, unexpected reboots, or device crashes. How to Check Your Current Firmware Version Some variants of the Huawei B311 support flashed
Open a web browser and type 192.168.8.1 into the address bar (this is the default IP address). which allows for advanced networking features
Updates resolve frequent disconnections and fix bugs that cause the router to freeze.
(formerly SmartHome) and accessible via a local Web UI for manual configuration. HUAWEI Global How to Update Firmware