If your phone doesn't see Nommi's network, please find any other device that can (laptops, tablets and etc.). Connect to Nommi using this device and go to 192.168.0.1 (or 192.168.173.1) while being connected to Nommi > Settings (login:admin, pass:admin) > WLAN > WLAN Advanced Settings > Change Country to yours.
Please watch the gif instructions in the attachment.
