If the software fails to read the phone, open Windows Device Manager. Check for yellow exclamation marks under "Ports (COM & LPT)". If present, right-click and manually update the driver pointing to the ZTE driver directory.
If you do not have professional hardware like an NCK Dongle, you can still unlock the ZTE Z320 through other methods:
Enter the specific ZTE Diag configuration code. Common codes include: *#983#87274# *#879*#
: Insert a SIM card from a different carrier. If you chose "Read Codes," enter the provided NCK when the phone prompts for a "SIM Network Unlock PIN". Alternative Methods
Unlocking your ZTE Z320 gives you the freedom to use your device with any SIM card from any network provider. This means you can:
Ensure you have installed the specific ZTE Qualcomm USB drivers. Try switching to a different USB port (ideally USB 2.0) on your computer.
These alternate sequences are common on ZTE phones and can force the unlock code entry screen to appear.