Hello, friend!
To obtain the HG633 firmware, click Software

Huawei ONT needs to be used with OLT and network management. The version must match the model. If the wrong version is used, ONT will not work.
The HG633 is a carrier product, if the software fails to be loaded, contact the device provider.
the HG, EG, DG, MA, and EA products are access network products.
In order to be able to deal with your problem in a timely manner, click: Access Network Forum
Please post your questions in the link section(the type of post must be "Ask for help"). You can also learn more about related products and knowledge sharing.
Welcome to the forum.
Thank you!