Hello friend!
1. Please click the link:https://support.huawei.com/enterprise/en/category/access-network-pid-1482605784817?submodel=9856746 to access the Access Network section of the support website of the Enterprise Network. All ONT products are displayed.
2. Click the type of device that you need, such as EchoLife HG8245U --> Software Download. All released software related to the product can be found here.
3. Click and download the software you needed.
NOTE:
You need to have a Huawei account and authority to download the firmware; if you don't have the authority, you can ask your provider to support and download it from the Huawei support website.
Thank you!