While specific "exclusive" 2021 guides often use third-party tools, the general process follows these steps:

GPON and EPON are fundamentally different architectures that operate on different protocols, data rates, and framing structures.

Look at the operational mode indicator. The architecture mode should now register as or Dual-Mode (Active: EPON) . Step 2: Change Mode and Adjust MAC/SN Parameters via CLI

In many cases, flashing the firmware exposes the code but does not automatically toggle the physical hardware mode. You must force the switch using Telnet commands.

Go to System Tools > Firmware Upgrade or More Functions > Manage Updates .

Open your terminal or Putty. Connect via to 192.168.100.1 .

Careless flashing can overwrite the customized board parameters, including your unique MAC address, Serial Number, and calibration data.

The target 2021 exclusive dual-mode/EPON firmware bin file ( .bin or .efs ).

The GPON-to-EPON conversion on Huawei ONTs is achieved by editing a critical system file named . This file contains the low-level identification and configuration parameters for the device.

While official conversion isn't supported, standard firmware updates are managed through: HG8245H5 - Huawei Carrier

Users who have successfully flashed "dual-mode" or converted firmware often report significant packet loss or registration errors with the ISP's OLT. Standard Firmware Update Process

The demand for conversion typically arises when a user changes ISPs. An individual may own a high-quality GPON router like the Huawei HG8245H5, but if their new ISP operates an EPON network, the device would be unusable. This leads to the necessity of either replacing the router or attempting to convert it from GPON to EPON.

or

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This indicates that the optical power level or wavelength is out of spec, or the mode did not switch correctly. Check your optical power levels through the web interface under > Optical Information . EPON networks generally require RX power values between -8dBm and -27dBm. The OLT Rejects the Authentication

: Some unofficial firmwares attempt to turn the device into an

# Via telnet/SSH set optical_mode gpon # or epon display optical_mode