Normally naka depende yung default user name and password sa brand ng router nila. Pero you may try the usernames and passwords that I've provided below: Feel free to let me know nalang if may nag work.
FiberHome ONU GPON routers
Username: user
Password: tattoo@home
Huawei HG8245H
Username: admin
Password: globe@XXXXXX
(XXXXXX = The last 6 characters of the MAC address of your router.)
To get your router's MAC address, follow these simple steps. Press the Windows key, search for the "cmd" app and press the Enter key to open it. In the Command Prompt window, type "ipconfig /all" and press Enter. Under the Ethernet adapter, look for the Physical Address.