Here are some direct download links for the Huawei Echolife Hg8145v5 firmware:
Legal and warranty notes
Some HG8145V5 firmware files are encrypted by ISPs. You may need a tool like Huawei Firmware Decrypter (HWFW_Decrypter) to extract the real image. Without decryption, the web interface will reject the update. Huawei Echolife Hg8145v5 Firmware Download