Some firmware is designed specifically to convert the modem between GPON and EPON modes. Only use these if you are technically proficient and understand your ISP's network type.
Here are some direct download links for the Huawei Echolife Hg8145v5 firmware: Huawei Echolife Hg8145v5 Firmware Download
Reputable forums often share official ISP-released files: Some firmware is designed specifically to convert the