@David-TP 

I tried but still not work

I find the problem is not all the machines use the same password "admin"

ex: my machine comes from AGL, and the password is support180.

if your machine comes from ACT then the password is act@123

I believe a lot of people have this problem,

all the answer tells you to press the reset 10 sec.

hope this post can help anyone stress for this question.

  @KingRome89 Double-check the login credentials for accuracy. If that doesn't work, try performing a factory reset on the modem by pressing and holding the reset button for about 10 seconds. This will restore the modem to its default settings. If the issue persists, it's best to contact TP-Link customer support for further assistance.

  @KingRome89 

I am having this problem too.

The advice I keep getting is that I need to reset the device and that I must have already created a password for it. 

This thing is new out of the box and the password printed on the device can still be used to add new devices to the network.

I ahev done a hard reset and nothing.

Tried using the other default passwords listed in this thread and still nothing

KingRome89 wrote

Can't connect to the TP Link VX230v Gateway the admin password don't work