Download ZTE Qualcomm Writer here

If IMEI number is missing for your ZTE modem, you can repair it by ZTE Qualcomm Writer program. Detect device by software, then click "Write NV Backup" button.

Open directory where software is located as there will be backup file placed automatically before flashing procedure or after you read it manually by ZTE Qualcomm Writer. Select backup file of your device and click "Open".

 IMEI number will be shown on the following window. Select "Write Only IMEI".

Wait for repair procedure to finish, then modem will be redetected by software with its repaired IMEI number.