halp

Hi good people I got problem with my LG G3 D855 I don't know it's European or what but I'm using in south Africa when I'm trying to switch ON it says LG SECURITY ERROR and goes OFF it was rooted and visions was 5.1.1 I even try to flash it with LG flash tool but it's not conecting:crying: now i don't know what to do plz I need help plz