Hi again Kamonechan

Just to add a bit more info to assist you.

With NMS and and NAT installed on your device i ask if you did activate and register NAT because 

there is a way for us to help you unlock the devcie by using NAT.

If NAT was activated and registered use the same email address and password used to now login

to the NAT website here.using a computer with those details.

For this process to work you will have to make sure you have a data signal available to your device.

Select Lock Device in the NAT UI  and then enter a passowrd or pin which you will have to use with

the Lockscreen that you will see on the screen of the device when it receives the Remote Lock

Command from the NAT website UI.

Enter the pin or password into the new Lockscreen  and you should now have unlocked your device.

I will also add you might have to turn the device on and off a few times before the device receives the 

remote lock command from NAT.

Then you can log back into the NAT website and select Found It.

Let us know if you require more assistance with this issue.

Cheers.