[AC Question]

I rooted my LG G4, and a couple of weeks later, T-mobile released an update. So im attempted to install the update, and about halfway through it stopped, and then said "error". Following in a few seconds after that, the screen went black and the android sign appeared with a red triangle above, assuming the "no command" position. i tried everything to fix it(including a factory reset), HELP please!

[Rukbat]

That's why you should NEVER try to update a rooted phone - the first thing you do after rooting is disable the updater app.

Now you'll have to reflash the stock ROM (then root it or not, that's your choice). If you don't already have everything backed up (you always should have anything important backed up - you can't recover data after a truck turns your phone into a pancake), you'll lose all your data.