I rooted my Samsung Galaxy Grand 2 (SM-G7102) and it was successful. But ever since then the Engineering mode has been missing on my Android phone. I have tried the factory reset and yet the same result. I can't update my Android software, how do I solve this problem?
*#*#4636#*#*
(available for most of the phones, name -> "Testing", activity->com.android.settings/.TestingSettings
); 2) name-> "EngineerMode", activity->com.mediatek.engineermode/.EngineerMode
, available for Mediatek devices usually. // Let's see which one is the case for OP. Could be a third case too. :) And based on the tag, may be OP is running stock 4.3 JB.