The process of unlocking Huawei routers is a community-driven effort. The most detailed and up-to-date guides are often found on tech forums. When you get stuck, these are the best places to ask for help.

Which (Windows, Mac, Linux) you are using to perform the unlock

Unlocking clears out your ISP credentials. You must manually re-enter your PPPoE authentication details and VLAN IDs under the WAN Configuration settings to connect back to your fiber network. Conclusion

Once you successfully gain superadmin rights to your ONT, you must secure the device to prevent your ISP from automatically overwriting your work during the next nightly reboot cycle.