help with Unlock Bootloader! topic

Hi guys and developers.
I need help with unlock my Htc one.
I try with Rumrunner but not working.
I have HBOOT 1.57 Stock ROM 4.4.2 Bandbase 1.13.41.0421!
And other question!
Flashing RUU 5.5, i can change my HBOOT?
Thank so much!