Hi there I don't really remmber where it is but try searching in your settings and you'll find it . (an option that says restore factory {or original} settings right ? ) or change these settings yourself Hope it was useful , and sorry for not being able to help anymore
Hi, i already repaired my phone K850i problem -auto off itself when receive call or receive message. Master reset cannot solve the problem. After reformat firmware , my phone back to normal. Cost to format firmware or software about RM40 only, ok hope can help you all ...thanks