Check IP using IP scanner and download and run putty.
Connect to the IP using the standard settings:
At the command like prompt you can enter the default username/password of a new device which is ubnt and ubnt
The device will load to the splash screen
Type info to conifrm the default addrss, you can then set this by typing:
Set-inform http://controller.jca-assets.it:8080/inform press enter, the device will now connect to the unifi portal and can be adopted and updated.
It will reboot and will take on the standard credentials which are Administrator - password is in the unifi portal.