Huawei Huawei ONU_Firmware Software Rewrite V300R13C10SPC800 Huawei EPON (ONU_Firmware software rewrite V300R13C10SPC800) is a service tool used to rewrite firmware on Huawei EPON ONU devices.

Complete Solution Guide

What This Tool Is For

• Recover dead / stuck ONU

• Reinstall damaged firmware

• Upgrade software version

• Fix boot loop / failed update

• Restore factory system files

Common Huawei EPON Models

Can be used on some Huawei EPON ONUs depending on support package, such as:

• HG8xxx series

• Some EchoLife ONU models

(Exact compatibility depends on firmware package inside tool)

Requirements

You Need:

• Windows PC/Laptop

• LAN cable or UART/Serial cable

• Correct Huawei firmware file

• Stable power supply

• Administrator rights on PC

Installation Steps

Method 1: LAN Upgrade (if ONU still responds)

1. Connect PC to ONU LAN port

2. Set PC IP manually (example: 192.168.100.10)

3. Turn off firewall temporarily

4. Open ONU_Firmware software rewrite V300R13C10SPC800.exe

5. Run as Administrator

6. Select network adapter

7. Select correct model/firmware

8. Click Start / Rewrite

9. Wait until complete

10. Reboot ONU

Method 2: Serial/UART Recovery (dead ONU)

1. Open device and connect UART pins

2. Use USB to TTL adapter

3. Open rewrite tool

4. Select COM port

5. Power ON ONU while connected

6. Enter boot/recovery mode

7. Flash firmware

8. Wait complete then reboot

If Tool Gives Error

“No Device Found”

• Check LAN cable

• Disable Wi-Fi

• Use only one network adapter

• Set static IP

• Try another LAN port

“Write Failed”

• Wrong firmware file

• Low power supply

• Antivirus blocking tool

• Run as Admin

Tool Not Opening

• Use Windows compatibility mode

• Install .NET Framework

• Install Visual C++ Redistributables

Important Warning

• Flash only matching model firmware

• Wrong firmware can hard-brick ONU

• Backup MAC / Serial / LOID / Config first

If You Tell Me Exact Model:

Example: HG8310M / HG8240 / HG8245 / HG8247

I can give you the exact flashing pinout + firmware rewrite method + unlock solution for that model.