If you are looking for a specific version to the device or downgrade (for example, to enable frequency locking), users in community forums often share these links:
Files such as WEBUI 11.0.2.1(W2SP13C7201) and CUST 11.0.2.1(C965) are sometimes hosted on third-party repositories like GSM Hosting Files , though official Huawei Support is always the safest source. Router is regularly unresponsive (B312-926) - HUAWEI Global Huawei B312-926 Firmware