Z431 unlock done by sigma.[Reference]
PROCEDURE:
1.Select "Qualcomm" platform from the tab menu in the upper left side of the software
2."Phone model" dropdown box has to be set to "Autodetect"
3.Go to "Unlock" tab
4.Power the phone ON
5.Connect the phone to PC with USB cable
6.Install required ZTE handset USB driver (only if the phone is connected for the first time); in some cases drivers can be installed automatically
7.Select ZTE Handset Diagnostic Interface in the ports selection tab
8.Press "Unlock" button *
9.The message "Unlocking phone... Done" indicates that procedure was completed successfully
Wait for the message "Restarting phone... Done" to appear in Sigma dialog window; only after that you can turn the phone off
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