Unable to unlock boot-loader

Hi,

My android tablet is iBall Brace-X1 which is….
· Android: 4.4.2
· Baseband version: iBallMOLY.WR8.W1315.MD.WG.MP.V34.P1,2014/09/28 15:07
· Kernel version: iBall3.4.67
· Build number: iBall Slide MJK Brace-X1_KK_V2.07,2016-01-12_19:19
· MT6592
And its RAM is 2GB and internal storage is 16GB.

To unlock boot-loader, I run in command prompt…
adb devices
List of devices attached
x.x.x.x device

fastbootoem unlock (after this command, I confirmed on tablet...

Unable to unlock boot-loader

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