Why my lg g3 wont open?

[34523623]

I have updated my Android system version 5 to 6.0 marshmallow.
now I try hard reset and my lg g3 wont open,its stay on startup screen.
what can i do?

 

[B. Diddy]

Duplicate, see discussion here: http://forums.androidcentral.com/lg-g3/738397-why-wont-open-my-lg-g3.html#post5517304. Thread closed to prevent parallel discussions.