If you must upgrade:

Step 2 – Access ONT via Telnet/SSH

• Enable Telnet: In web interface, go to Security → Service Port → Enable Telnet.
• Connect: telnet 192.168.100.1 (User: root, Pass: admin or Huawei123).

Critical settings to reconfigure:

| Setting | Where to find it | Typical Value | | :--- | :--- | :--- | | WAN Connection | WAN > WAN Configuration | Route mode, VLAN: 101 (varies by ISP) | | PPPoE | WAN > PPPoE | Username: your-isp@internet | | Wi-Fi 2.4GHz | WLAN > Basic Settings | SSID: YourName, WPA2-PSK | | Wi-Fi 5GHz | WLAN > Radio Settings | Channel: 36-48 (DFS-free) | | ONT Authentication | System > ONT Authentication | LOID (Provided by ISP) |