remote : oem unlock is disabled ?

Hi
I get the chinese version of oneplus 2 and it is running HydrogenOS. I don't like all the chinese bloatware so I decided to install oxygenOS, the one linked here :http://forum.xda-developers.com/onep...olbox-t3178267
But I try to unlock the bootloader, I get this message :
FAILED (remote : oem unlock is disabled)
Any clue on how unlock the boot loader.
Thanks a lot.
Nabolito.