But some apps will erase together bacause they are put in data partition, not system partiton.
See this issue on this topic http://forum.xda-developers.com/show....php?t=2191572
And.....I found that M8 got a same problem ,too!
I unlocked my M8 at beginning and I'm not going to care this problem.
Today I found that flashlight and calculator are disappeared.
Fortunately, M7 have 4 apps disappeared, M8 I found only 2 apps.
But flashlight app I will use it sometimes. Does anyone have a backup?