Unhappy [Q] Unlockable Bootloader?

I have rooted my SGP321 (Tablet Z 16GB LTE) but when I check and enter the code to see if I can unlock my bootloader I get a NO returned
Does this mean there is no way around unlocking it?
There must be a way out there to unlock it but thus far Google and the internet has failed me.

Sorry for the questions. (I wish it was as easy as installing ROM's on my HTC One)

Much apreciated if anyone out there can help me out