| Risk | Impact | Mitigation | |------|--------|-------------| | Wrong firmware version | Bricked device (no boot) | Triple-check hardware revision & region code. | | Power loss during write | Permanent flash corruption | Use UPS/laptop on battery. | | ISP lock re-application | ONT may re-lock to original ISP | Avoid ISP-customized firmware; use universal/unlocked builds. | | Configuration loss | All custom settings erased | Manual screenshot + backup file. |
Note the (e.g., V500R019C20SPC135).