Hello.
There is one of the latest firmwares/Security patch level in your device:
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Firmware compiled date: Mon Jan 8 12:22:14 KST 2018
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Security patch level: 2018-01-01
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Unfortunately, "Unlock" operation not supported for latest firmwares/Security patch levels for this device. You can try to downgrade phone's firmware at your own risk (downgrade may lead to phone damage) and then perform the "Unlock" operation again.