Some newer HG8245H variants are factory-built as XPON. These can often be switched via the command line (CLI) or the web interface without a full firmware flash.
Newer "XPON" (Dual Mode) firmware allows the optical transceiver to sense the network type and switch automatically.
A: No. It disables GPON-specific features (Dying Gasp, OMCI) and enables basic EPON bridging. Do not expect advanced QoS.
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Even after conversion, service provisioning pages may appear incorrectly or "messed up" because the hardware is being forced into an unintended mode. For official technical support and manuals, refer to the Huawei EchoLife HG8245H Support Guide default login credentials for your particular region? How to flash a GPON router to EPON/XPON?