problem to unlock zte f188

hello how to unlock zte f188

SigmaKey 1.34.00
xxxxxxx Sigma dongle 1.36, Initializing... OK
--- 2014-01-17 17:35:54 ---
SigmaKey 1.34.00 Qcom: Direct unlock
ZTE Handset Diagnostic Interface (COM682), Provider: ZTE Corporation, Driver ver.: 5.2066.1.6, Date: 08/09/2010, USB\Vid_19d2&Pid_0010&Rev_0000&MI_01
Error writing to serial port

thank you

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