The download was slow—33 MB taking forty minutes over tethered phone data. As the file transferred, Minh noticed something odd. The file name ended in .bin but contained a nested folder structure he’d never seen before: system/restore_huawei_backdoor/ . His heartbeat quickened.

If you encounter any issues during the firmware update process, here are some common problems and their solutions:

Enable Telnet. Many HG8245W5s have Telnet on port 23 disabled. You may need to enable it via the "ONT Maintenance" page using a backdoor (search for "Huawei 3.0 backdoor for HG8245W5").