There are several ways to update the B315s-22, ranging from simple automated updates to advanced manual flashing:
Official firmware is rarely distributed directly as a "universal" file for consumers by Huawei, but can be found through community mirrors: huawei b315s-22 universal firmware download
Universal firmware is a customized firmware that can be installed on various Huawei routers, including the B315s-22. It's designed to work across different regions and networks, providing a more stable and feature-rich experience. There are several ways to update the B315s-22,