ZTE Z-431 Unlock Done By SIGMA BOX.[Reference]
Tools and Procedure:
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...
Heres the Logs:
SigmaKey 1.20.03 Qcom: Direct unlock
ZTE Handset Diagnostic Interface (COM126), Provider: ZTE Corporation, Driver ver.: 5.2066.1.8, Date: 1/13/2011
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: 86183100328xxxx
Bluetooth address: CE88C7E26DF4
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\Administrator\My Documents\SigmaKey\security backup\86183100328xxxx_ATT_AM_P671A90V1_0_0B17-S.skb"
Unlocking phone...Done
Restarting phone...Done
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