You mean LibreELEC, not openelec
from here thread-5274.html S905
install instructions thread-5556.html
device tree is the RAM size in your case 1GB & LAN ie 100Mbit or 1Gbit I don't know what you have, but if at first you don't succeed try try again
in other words, just try different trees till you get one that works.
OK 1 more question if i put in the SD card will i have Android stille or will it override delete Android from my box