My bootloader won't unlock

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Android Central Question

I have a lenovo vibe x3a40 and i am trying to flash custom recovery in it . So first i have to unlock bootloader. I have adb tools and i connected my phone to pc and i rebooted my phone to bootloader. I typed in "fastboot oem unlock go" to unlock bootloader but cmd says " failed: can not use this command on user version" so i am stuck here. Can anybody help me please?? Thank you