Afterthinate my s4 to newest firmware, my phone work much better from before...already play with camera many time also try acces camera from apps like wechat and never counter reboot issue anymore... But the purple smearing issue is still there...u can notice especially when you try to scroll webpage that contain black picture and white background (like comic from mangapark.com)... and this a bit annoying for because i always read comic from my phone when i travelling...