Comtrend ADSL2+ Router CT-5621T

Try this one Enter your username and password, By default both the username and password are admin. Click the Ok button to log in to your router.. If the default username and password wont work the next step here is to reset the router so it will be back to its default settings with the default username and password....

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I used the following for username and password and it worked!! User name: user, password: user

actually, the username and password for that modem (by default) is root / 12345