Huawei does not publicly host consumer downloads. However, the Huawei NCE (Network Cloud Engine) or ONT Upgrade Tool (v500R022C00SPC200) allows advanced users to extract firmware.
Communities like dslreports.com or gpon.solutions sometimes host official dumps. huawei echolife hg8245w5 firmware download exclusive best
The HG8245W5 supports dual-band Wi-Fi.