Hello, friend!
I'm sure you've looked at other history posts and documents on the forum.
As we say to other users.
The forum does not have firmware.
The firmware of an ONT is generally held by the device provider and the ISP because they sell the ONT and related services.
All we can offer you is the ONT upgrade software. Please click EchoLife EG8245Q
The ONT must be registered on the OLT. The OLT can register the ONT through the CLI or NMS.
If you need commands and methods, please leave a message.
Thanks!