Upgrading the firmware on a Optical Network Terminal (ONT) is primarily managed by your Internet Service Provider (ISP), as unauthorized manual upgrades can disrupt your fiber connection or brick the device.
If you are uncomfortable with any step, contact your ISP. Many will push firmware updates automatically over TR-069. However, for the enthusiast who wants the best out of their fiber connection, a manual upgrade is well worth the effort. Huawei Hg8245h Firmware Upgrade
Click Browse and select the new firmware file (usually .bin or .img ). Upgrading the firmware on a Optical Network Terminal