The Huawei B310s-518 is a Category 4 LTE CPE (Customer Premises Equipment) router. It converts 4G LTE signal to Wi-Fi and LAN ports.
Прошивка Huawei B310s-518 Firmware 21.323 ... - 3Ginfo huawei b310s-518 firmware
To give you the most relevant blog post or firmware guide, could you tell me: The Huawei B310s-518 is a Category 4 LTE