This setting is fix, and it is configured on the factory, but it is possible to change it using an special Stratasync deployment package.
1.- You have to get this package from Division R&D
2.- Go to StrataSync -> Assets -> Firmware upgrade -> ONX CATV -> upload package
3.- Selected the .zip file containing the WiFi country code you want to deploy
4.- Selected your meter -> deployed
5.- Sync your unit to Stratasync
6.- Reboot the unit
7.- Your meter will show now the WiFi region deployed.
This is the list with the available regions: