HUAWEI B311 series, specifically models like the B311-221 and B311-521, is a Category 4 LTE CPE (Customer Premises Equipment) designed for residential and small business use. Its firmware architecture is built on the HiSilicon Balong V700R11C70B187 platform
Carriers often lock OTA updates. If your router is from Vodafone, T-Mobile, or Telstra, the OTA check may return "No updates" even if newer firmware exists.