to the computer via USB. In the software, select "ZTE modems" from the manufacturer drop-down menu and set the model to "Auto detect".
DC-Unlocker is widely considered the standard tool for unlocking ZTE data cards and modems.
If you prefer not to use specialized software, you can request or calculate an unlock code based on the device's IMEI. How To Unlock A ZTE Modem Using The Dc Unlocker