ZTE updates its security every year. Tools from 2018 cannot unlock a 2023 MF983. Use ZTE FFF (Force Firmware Flasher) to downgrade your modem to a vulnerable firmware version, then run the unlock tool, then re-upgrade.
You cannot unlock a modem Windows doesn't see. Install ZTE’s official drivers or use DC-Unlocker’s autodetect feature. zte modem unlock tool
To unlock a ZTE modem, the two primary methods are using automated software like DC-Unlocker or generating a manual NLC (Network Lock Code) using the device's unique IMEI. 1. Automated Tool: DC-Unlocker (Recommended) ZTE updates its security every year
While the exact steps vary by software, the standard procedure follows this flow: then run the unlock tool
Example response for a locked modem: