What files you'll need to edit totally depends on what part of the statusbar you want to change.
Then there's the point of copying over files, which is (most of the time) not an advisable option because there can be so many changes between them, and you even the slightest mistakes will softbrick your device. So be careful, and try to walk before you can run. Follow some guides first and then go and try stuff on your own.
As for fixing hardware issues, that's something totally different. And can only be done when compiling ROMs from source. (again, first walk. Then run)
Verstuurd vanaf mijn Nexus 4 met Tapatalk