Zte A320 help ,i have error unlock

--------- 2018-06-23 20:16:33 ---------
SigmaKey 2.28.00 Qcom: Direct unlock
ZTE Handset Diagnostic Interface (COM6), Provider: ZTE Corporation, Driver ver.: 5.2104.1.2, Date: 2014. 03. 17., USB\VID_19D2&PID_0249&REV_0310&MI_00
Phone model: Blade A320
Version: SWC_CH_P809F20V1.0.0B04,
Firmware: MPSS.JO.3.0-00291-8909_GEN_PACK-1.98558.1.104587.1
Date: Jul 3 2017 09:56:37, Jun 22 2017 00:00:00, 8909.gen
Sending boot...Done
Restarting phone...Missing response from phone


Can say me why ? Thanks