I have customised my Redmi Note 2 by editing system/build.prop to change screen density. This is great, but it does make the lock pattern too small. Can this be changed? For instance, is there a 'com.miui.lock' file I can customise and put in /system/media/theme/default/, like I do with com.miui.home? While I am here, is there a way to make these changes be preserved when Miui updates? Is there a user theme settings folder that isn't removed or overwritten by the update process, and can override the defaults?