Without schematics, this is nearly impossible. Most technicians replace the entire ONT rather than JTAG flash.
Ensure the firmware binary file ( .bin or .efs ) exactly matches your ONT's specific hardware model and hardware version (e.g., HG8245H vs. HG8245Q). huawei ont firmware flash tool
Revert your PC's network card settings back to "Obtain an IP address automatically" (DHCP). 🔍 Troubleshooting Common Errors Tool Status Stuck at "Connecting" or "Sending" Without schematics, this is nearly impossible
A reliable Cat5e or Cat6 cable. Never flash firmware over Wi-Fi. huawei ont firmware flash tool