[Q] Z1 cyanogen 12 (lollipop) on Xperia Z1 bootloader allowed: No ?

Hi XDA!

I just did a straight 7 hours research on how to install cyanogen rom on Xperia Z1, then i saw that we can't on smartphone that is not allowed in the bootloader.
But i saw that we can install with some roms ready for bootloader not allowed. but i didn't find any of the latest version.

And i don't know why we can't toogle it ON... Some websites give their services to toggle it ON. but how they do that ... And no solutions for open public to counter that...

Is there a solution that i miss to pass the bootloader ON ?
Is there a cyanogen mod for xperia Z1 on lollipop for BL ON ?
Is there other solutions ?

Thanks a lot !