Please halp me. 
My LCD is broken and I have to replace it. I have bought a new one through Aliepress. I have installed the new LCD, but when I turn on the screen is black. I have contacted the seller and suggested updating the system to Android version 7.0.
but in the cellphone I can't update (build number bv6000_blackview_v01_20161011 android version 6.0). What steps should I do?whether indeed when replacing the LCD must first update the system ??
Thank you

Click the link below and try to update your phone to Android 7.0:
https://mega.nz/#!Rw9UWaQb!USyuDp8CBElFi-3gkxbEc3kQIQip-U7OrxEiNqvy5WI