Modifying the B311-221 firmware is for everyone. You can brick it.
Open a browser and enter the default IP address (found on the bottom sticker). Navigate to > Manage Updates . Select Update Now to check and install available software. Via AI Life App: Connect your phone to the router's Wi-Fi. Open the AI Life App and select your router. Go to Updates and choose Check for updates . Automatic Updates: huawei b311-221 firmware
The good: