mobile

I RECENTLY UPDATED MY LG G3 TO LOLLIPOP 5.0 AND I CANT OPEN SUPER SU, I TRIED DOING ABOUT 5 DIFFERENT THINGS TO UNROOT MY PHONE... WHEN I DO THE PROCESS WHERE I PLUG USB INTO COMPUTER AND HOLD THE VOLUME DOWN WHILE PLUGGING IT IN, THE PHONE WONT DOWNLOAD IT STAYS AT 0%. .. THE LG FLASH TOOL I CANT DOWNLOAD. IT KEEPS BRINGING UP ERRORS.. I TRIED DOWNLOADING FROM 3 DIFFERENT PLACES... I JUST WANT TO GET BACK TO MY STOCK PHONE....

After trying all of that to remove the issue when launching SuperSU "There is no SU BINARY installed, and SuperSU cannot install it. This is a problem! If you just upgraded to Android 4.3, you need to manually re-root - consult the relevant forums for your device!", it still isn't resolved.

Any help?
THANK YOU IN ADVANCE..