Users can theoretically repurpose the HG658b as a simple switch or a secondary wireless access point (by disabling the WAN/DSL functionality), but the core routing and modem functions are locked to Huawei’s proprietary, un-updateable firmware.
For practical application, firmware for the HG658b is typically managed through its web interface. Check Version Log in to the gateway (usually at 192.168.1.1 ) and navigate to System Information Device Information Update Process Maintenance Device Management Firmware Upgrade Huawei Hg658b Firmware