Ok so I rooted my friends phone when he had FRG01b with that uniroot or something ( to lazy to do it the old fashioned way) and it worked. He however did not want me to put a custom rom on. About 3 days later he gets the new update and installs it, now he still has root access and super user but any app that requires root says. He doesn't have it anymore. I've never had this problem before because I've been running custom roms since day 1 so how might I be able to fix this without a factory reset or anything