If you obtained your DG8245V from an ISP (like Movistar, Telmex, or regional providers), you likely have a "locked" or "customized" version of the firmware.
Flashing generic firmware may brick your device if you use the wrong version. It can also render VoIP settings impossible to recover without a full backup. huawei dg8245v firmware
After the router reboots:
Updating the Huawei DG8245V firmware can deliver several key improvements: If you obtained your DG8245V from an ISP