Because the Huawei HG8245H is an ISP-grade Optical Network Terminal (ONT), finding a useful blog post for a firmware upgrade is tricky. Most ISPs lock the firmware update section, meaning you cannot manually flash the router even if you find the file.
Connect your computer to one of the LAN ports on the HG8245H. Huawei Hg8245h Firmware Upgrade
If issues arise, reload the previous firmware using the same method. Because the Huawei HG8245H is an ISP-grade Optical
: Never perform a firmware upgrade over Wi-Fi. A brief signal drop can permanently damage the router. Huawei Hg8245h Firmware Upgrade
: Ensuring the device can properly interface with the latest web protocols and streaming technologies. The Upgrade Process: Precautions and Implementation