If you have an enterprise account with the necessary permissions, you can find software packages on the Huawei Software & Firmware Download page. Search for "HG8245W5" to see available versions.
The is a popular dual-band GPON/EPON ONT (Optical Network Terminal) with built-in Wi-Fi 5 (AC1200). Finding official firmware for this device can be challenging because Huawei typically does not provide public downloads for carrier-branded units.
Software & Firmware Download of Enterprise Products - Huawei. Huawei Technical Support Huawei EchoLife HG8245W5 Support Guide, Manuals & PDF