No "Enable OEM unlock" options in developer settings

Hey guys, I just tried to unlock my bootloader. I have obtained the unlock code and everything. I try to execute this command

Code:

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fastboot oem unlock XXXX

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, I always get stuck at

Code:

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waiting for devices

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1. I have updated my device drivers.
2. For some odd reason, the toggle for "Enable OEM unlock" is not present in the developer options.
3. Now, I have updated my KIW-L22 to B340 version recently. Maybe the toggle is removed in the recent update. Is there not any way to bring back that toggle so that I can unlock my bootloader?

Please guys, I need your help with this, if anyone has ever encountered this before, please tell me how to bring it back.