[Q] [CloudyG2 3.3] secure booting error boot certification verify

Hi! I have a lg d805, the official stock rom is 4.2.2 (jb) that is a bit useless for many purposes; so I decide to install the rom cloudyg2 3.3 based on lp.
It installed successfully; however , when I try to go to recovery mode I get the mentioned error. is there any way to install twrp directly without flashing to stock rom?
(Sorry for my english, im latin)

Pd: I can enter to download mode normally too.