restart your device and after restarting press power key you get lockscreen and swipe the camera from there first time or use camera app from playstore
because the software drivers of j7 and j5 2015 are not sutaible or not made for nogut they made for lolipop and in end of 2015 j7 recieves marshmello update and the update policy of samsung is for 2 years so the chanses for j7 and j5 for nogut are w...
