The standard procedure to access the modem IP(default gateway) address is
(A)Start RUN type cmd Ok
New window will open
type ipconfig /all
will show what you have entered .
(B)Start Network LAN/WLAN
Network settings page opens
Select obtain IP address automatically
Go back to (A)
(C) Enter the default Gateway
example. 192.168.0.1 etc
(D) If You are connected to Internet and can surf
Check your IP Static or Dynamic
Then enter it in Browser address bar.
Then a window will open to access the router.
(E) Reset the modem with power on for 20 to 30
seconds . Factory Defaults are Restored.
If the ISP has changed IP/Modem UserID/PW
we cannot do anything.
(F) alternate UserID support password
............... user password.