Unlock Bootloader (Read-only)

Bootloder unlocking of LG G6
I've bought an G6 because the Device list on the Developer page says that G6 (for the european market) is able for unlocking the bootloder.
Now when I try to unlock the Bootloader I become a message that H870S is not able for unlocking.
Whats going on here? What must be done to unlock the bootloader?
Posted on 6-May-2018