If the upgrade fails, do not turn off the router immediately. Try to log back in and re-apply. A failed update can "brick" the device, requiring professional service.
The router will upload the file, flash the memory, and automatically reboot. The status lights on the front of the Huawei ONT will flash rapidly. Step 4: Verification and Post-Update Checklist huawei hg8145v5 firmware download install
Always back up your configuration before starting, as some updates may reset custom settings. How to Download Huawei HG8145V5 Firmware If the upgrade fails, do not turn off the router immediately