If you have confirmed that your HG8245H hardware supports dual-mode or that you have a verified crossover firmware, gather the following:

Connect your computer to the ONT via Ethernet and navigate to 192.168.100.1 in your browser.

: Detailed guides and community-sourced firmware files can often be found on the Huawei Enterprise Support Forum or specialized networking communities.

This is the method used by advanced users because it allows you to interrupt the boot process.