I had it rooted for a while (week or so) and it started acting up, so I unrooted it, or at least tried, several times, and finally superuser went away, etc. Now, after I factory reset it, it says "system update available" I click it, it does it's thing, reboots, and then it shows the little android guy with a white triangle with an orange exclamation point in it, and basically just does nothing. I've tried everything! factory reset doesn't work, and it just will NOT upgrade. Is there a way to do it manually, did it not get fully unrooted? because superuser is no longer there..