here is log thanks to sigma team
SigmaKey v.2.14.01
347369419 Sigma dongle 2.14, Initializing...OK
Pack 1: Not activated
Pack 2: Activated
--------- 2015-12-07 10:01:10 ---------
SigmaKey 2.14.01 Qcom: Direct unlock
ZTE Handset Diagnostic Interface(DFU) (COM52), Provider: ZTE Corporation, Driver ver.: 5.2066.1.8, Date: 1/13/2011, USB\VID_19D2&PID_0112&REV_0000
Version: 76XXU-2040-USNEKOLYM
Detecting flash...MT29C8G96MAZBADKD, ID: 002C00B3
Flash size: 1 Gb, page size: 2048
Software IMEI: 3557320311......
Security area saved to "C:\Users\DRPHONE\Documents\SigmaKey\security backup\76XXU-2040-USNEKOLYM.skb"
Unlocking phone...Done
Restarting phone...Done
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sucessfully unlocked ZTE T790
