unlock Huawei Y625 mising response from phone

hi
when i unlock this phone Huawei Y625 sigmakey service pack 1 already activated get this err message the following

SigmaKey 2.15.02 Qcom: Direct unlock
USB Serial Port (COM11), Provider: FTDI, Driver ver.: 2.12.14.0, Date: 1/22/2016, FTDIBUS\COMPORT&VID_0403&PID_0000
Missing response from phone

on top left corner in setting select qualcom help me with please need to unlock