If the ONT is still accessible via a browser, you can often perform a simpler update: Log in to the ONT web UI.
Set your PC to a static IP in the same subnet as the ONT. huawei ont firmware flash tool
The most common tool erroneously called the "flash tool" is (e.g., ONTUpgradeTool_V300R016C00SPC001.exe ). If the ONT is still accessible via a
Minimize risk if you proceed with community tools huawei ont firmware flash tool
python ontflash.py --ip 192.168.1.1 --user root --pass admin --firmware firmware.bin
An OLT (Optical Line Terminal) upgrade remotely pushed a corrupted signature.img to an HG8547M. The ONT power cycled every 40 seconds.