Ive flashed a lg optimus about a week ago and everything worked fine. the kid i flashed it for wanted to get his apps going and it was his cousins phone and he didn't know his gmail password. did a master reset and the sprint id screen appeared of course.

Phone was rooted with z4root.apk. Used Titanium backup to take the sprint id off of it before the factory reset. but now i do the same thing and titanium backup says the phone is not rooted.

Kind of lost at what to do next.