REFERENCE ZTE z431 unlock done via sigma box.....[Reference]

[AltF4]

Tools and Procedure:​

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1. Sigma BOx​

2. c1-01 usb cable​

3. Install driver in phone​

4. Choose qualcomm mode in sigmabox​

5. Choose correct serial port​

6. Click direct unlock​

7. See Logs...​

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Heres the Logs:​

SigmaKey 1.25.03​

148234799 Sigma dongle 1.27, Initializing...OK​

SigmaKey 1.25.03 Qcom: Direct unlock​

ZTE Handset Diagnostic Interface (COM9), Provider: ZTE Corporation, Driver ver.: 5.2066.1.9, Date: 6/2/2011​

Version: ATT_AM_P671A90V1.0.0B17-S, 1.4.​

Firmware: ATT_AM_P671A90V1.0.0B17-S​

Date: May 25 2012 17:27:30, Feb 02 2012 18:00:00, KPSZL​

IMEI: 861831001784467​

Bluetooth address: 12D9BCCFE034​

Phone model: ZTE Z431​

Detecting flash...HYNIX_H8BCS0SI0MBR, ID: 00AD00BA​

Flash size: 256 Mb, page size: 2048​

Reading security block...OK​

Security area saved to "C:\Documents and Settings\juffa\My Documents\SigmaKey\security backup\861831001784467_ATT_AM_P671A90V1_0_0B17-S (0).skb"​

Unlocking phone...Done​

Restarting phone...​

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done......​