You accidentally pressed the reset button of your Zyxel Prestige 600 series modem. You don’t know how to configure it. You then called 172 (PLDT customer service number for MyDSL) and the CSR told you that a technical crew will be sent over to your house but who knows when they will arrive. Why don’t you just try the following:
Make sure your modem is turned on
Open Internet Explorer
Enter this URL: http://192.168.1.1
If you’re asked to enter a login and password, enter admin for username/login and 1234 for password
You’ll be taken into the zyxel modem configuration menu, choose wizard
and then save, that’s it. Your modem is as good as new.