[Q] Xperia SP C5303 how to unlock bootloader topic

So I have Xperia SP C5303 rooted with towelroot and have xposed installed. And now I want to install a cm11 Rom or something similar. I found some for locked bootloader, but I think its better to unlock it and install Rom normally.

So my question is how to unlock my Xperia bootloader if it says "allowed:NO" but not sim-locked?
Some pic's I think that can help.

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