How can I repair my Android devices system?

A

AC Question

how can I repair my android devices system

I turned my developer options ON and one day I decided to clean my phone... I accidentally deleted some kind of system application... now my phone starts normally but I cant see homescreen and phone tells me all the time ''Unfortunately, System.UI has stopped''... I have tryed to restore the factory settings but it wont work... what can I do? do I have to install some kind of ROM? my android version is 4.2 (jelly bean)... I cant even get connection between phone and PC!!
 

B. Diddy

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Welcome to Android Central! Which phone, and is it rooted? If you're unrooted, you can't accidentally delete a system app.
 

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