The is a professional hardware tool used for carrier unlocking, IMEI repair, and firmware flashing for various mobile brands, including ZTE. For the ZTE Z320 , the NCK Dongle can be used to calculate or bypass the Network Control Key (NCK) to unlock the device from its original carrier. Official Software & Support
An NCK (Network Control Key) dongle is a small device that is used to unlock mobile phones. It is a hardware tool that connects to a computer and is used to send unlock codes to a phone. The NCK dongle is specifically designed to work with ZTE phones, including the Z320 model. zte z320 unlock nck dongle link