May I know if you press "reset" button over 10
seconds? You can check if press it for 10 seconds or until the power
LED begins to blink and then release it. After that, the defaults have been
restored and then device restarts.
If above steps cannot help you to recover,
please help to check:
login password is the same
as the label of your device or not?
Where is your location and
service provider (ISP)?