just broke my phone yesterday
I accidentally damaged the OS by reinstalling the System UI base APK (my phone is a samsung galaxy j3 emerge running android 6.0.1 marshmallow)
After i reinstalled the system ui base apk my phone told me that it was going to restart. (no biggie right?) OK, so the phone restarts, then it tells me the system ui crashed. i press ok, then it does it again, and again, and again. It goes on forever.
Now i freaked out bc i cant access any apps, nor can i do anything to undo what i did.
luckily with a little bit of research, i found out how to fix this.
With every phone that runs android os, there is a "Recovery Mode". It is activated using a combination with the power, volume keys, and if your phone has a physical home button, that may also be needed to activate recovery mode.
I did that, and reset my device.
Luckily i didn't lose all of my data, because i have a sd card and just used that.
That sums up what happened recently, now i have to go back to chores