Have a good time in my thread!
First off all Big thanks, credits and all respect for that mate who told me this little thing!
If you install one of these themes below, apply them and after you reboot your phone (to get all the possibilities what these themes can give you) then you press Vol+ (up)/Vol- (down) buttons, its possibly, that you will get the next error/bug,
Official themes, like TriFlat or Woody:
- Little black box
- The phone cant boot up - Bootloop!!!
- Open a filemanager like ES explorer, Root explorer, Solid explorer
- Go to system/vendor/overlay
- Find "android-res.apk" (normal its the first one in the list) and DELETE it!