I use System app remover ( New2Android | Comments Are A Developers Portal To Improvement
) to debloat my phone after rooting. I always make a backup using the program, before uninstalling. I have access to all the apk's that were backed up. when I try to reinstall an app, the remover program asks me if it is a system app, and I select yes, it installs it, but then it is not functional.
in the folder of backups, you will see the apk file and an additional file with same name saying "deodexed"
basicly, I am trying to reinstall the "job manager" app. this is on the S4 where you hold down the home button, then you get a list of running programs and then you have the option to kill the running apps. right now I can hold the home button and view running apps, but can not kill them, the option is gone.