Post SystemUI won't load

Hi there,
Yesterday i replaced my SystemUI.apk and i backupped the original one.
Today i replaced the new SystemUI.apk and SystemUI.odex but now it won't load.
Also it's not shown in Settings > Apps > All Apps and now i doesn't have a status bar or navigation bar.
How can i fix it? Asus won't send me the stock firmware..

It's on my tablet on Android 4.2.2 Jelly Bean.
The tab is a Asus Memo Pad 10 (ME102A)

Kind Regards,
Rico_515.