Hello, friend!
You need to log in to the WebUI of the device using the administrator account and choose Security > Device Access Control > LAN Business and Wi-Fi Business.
The services telnet and ssh must be enabled.

Connect the ONT to the PC using a UTP cable, and log in to the ONT using PuTTY Telnet or SSH.
Welcome Visiting Huawei Home Gateway
Copyright by Huawei Technologies Co., Ltd.
Login: root
Password:
Password is default value, please modify it!
WAP>
Thanks!