How to fix Galaxy Core Prime duos with home key disfunction?

[FortuneNowake]

I uninstalled com.keyguard.android.apk on my Samsung Galaxy Core Prime Duos because it kept on saying 'unfortunately com.keyguard.android has stopped' and after i uninstalled it, Home button and recent applications buttons stopped working together with lock screen, now I can't install the keygaurd again because it is a system apk, how can I fix this?

 

[steiny180]

Have a look at Notification Toggle. It allows you to put shortcuts in your notification window including a shortcut to your home screen.

 

[kate]

Here is a readable version of the question:

I uninstalled com.keyguard.android.apk on my Samsung Galaxy Core Prime Duos because it kept on saying 'unfortunately com.keyguard.android has stopped' and after i uninstalled it, Home button and recent applications buttons stopped working together with lock screen, now I can't install the keygaurd again because it is a system apk, how can I fix this?