Download ((NEW)) B310s UPDATE 311 Universal Bin
This post provides Firmware Huawei B310s-22 Update 21.311.03.00.00 (Universal), which can be downloaded from the link provided at the end of the post. Once downloaded, extract in a folder using unzip software, and process as mentioned in the respective post. Wrong firmware/software change of a Huawei / ZTE modem/router may dead your device permanently. While running the Huawei firmware update, it will prompt for firmware/flash code as a password. You can generate the firmware code from the universal master code tool.
Download B310s UPDATE 311 Universal bin