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As of mid-2025, the most common stable versions are from the V500R020C00 series, specifically SPC200 or higher. However, many ISPs remain on V500R019 for stability.
No. The HG8245W5 has a proprietary dual-core chipset (often a Realtek or Huawei HiSilicon) that lacks open-source drivers for the GPON MAC layer. You cannot replace the bootloader or OS. Huawei Echolife Hg8245w5 Firmware Download
This means the ONT cannot register with your ISP’s OLT. The firmware probably changed your ONT’s serial number or vendor ID. You need to revert to your old firmware or call your ISP to re-authorize the device. As of mid-2025, the most common stable versions