If you have acquired a legitimate, compatible firmware bin file matching your device variant, use the following manual update process: Step 1: Pre-Upgrade Preparation
ISPs heavily customize the firmware. Consequently, a DG8245V-10 from Brazil will have a different firmware interface, features, and locking mechanisms than one from Spain or Germany. This is the primary source of confusion online. Huawei Dg8245v-10 Firmware