ZTE A302+ Proplem

i proven to unlock ZTE A302+ some are be unlocked other can't
i intend this error

Connect sound supercharged on !
Start auth !
SW Ver: EF-RW-TIGO-P108A19FM(S)V1.0.0B01
Imei: 357441021709923
Done;
Press noesis on !
Starting act ...
Platform: E-Gold Voice ...
Preloader dispatched ....
Loader dispatched ....

Flash ID(0): 20FA:8000
Unknown winkle id ! Contact hold !
Error ... !
Time necessary - 00:00:17