Locate and select Diag + ADB (or Qualcomm Diagnostic Mode). Connect the phone to your PC using the USB cable. Step 2: Verify Device Manager Connection
How to Unlock the ZTE Z320 (Z233VL / Cymbal) Using NCK Dongle zte z320 unlock nck dongle link
via USB and click a button to unlock it, as shown in this video . Locate and select Diag + ADB (or Qualcomm Diagnostic Mode)
If phone says “Code Error” after 1 try, re-check IMEI. Never try more than 2 times – contact dongle support. zte z320 unlock nck dongle link