I knew I did eveything possible to work. So the rom must have some bugs on the d805 version. Other could boot and use it normally. D805 users dont
It is quite simple. I did that. You must download LG FlashTool 2014 ( it is here on xda). Download the right kdz file for your version. The put your phone in download mode and plug it to the pc. There is a tutorial here : http://forum.xda-developers.com/show....php?t=2797190
Use CSE flash.