From the User Interface (UI) use the 'Network' tab and select 'Wireless'
Locate the SSID for your Anonabox PRO and click the associated 'Edit' Button
The first Section should be 'Device Configuration'; find and select the 'Advance Settings' tab.
Find the 'Country Code' drop down and select anything but the USA.
Click 'Save and Apply' and you're good to go.