zte t12 unlocked by sigmakey new updated...[Reference]
procedure
Select "MTK" platform from the tab menu in the upper left side of the software
Go to "Unlock" tab
Turn the phone off
Connect turned off phone to PC with USB cable
Install drivers for all devices that will appear in the system
Important: use drivers from Sigma Support Area only!
Select Android Gadget VCOM in the ports selection tab
Press "Direct Unlock" button
Message "Unlocking phone... Done" indicates that procedure was completed successfully
Disconnect the handset
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