Updating the firmware for your Huawei EchoLife HG8321R ONT (Optical Network Terminal) is primarily managed through the official Huawei Enterprise Support Portal
Software & Firmware Download of Enterprise Products - Huawei echolife hg8321r firmware download
If you have obtained the correct firmware file, follow these steps to update your EchoLife HG8321R. Updating the firmware for your Huawei EchoLife HG8321R