After the update many a times it happen, That my device don't wake up after pressing lock key(Meaning it functions as it is like but nothing comes on display, many time i have to pick up call just swiping on screen when nothing comes on screen)and ultimately i have to restart. The phone is not able to boot if the memory card is in slot. And after this update my phone is not able to read memory card .:crying::crying::crying::crying: