Mistakenly given wrong names to TetheringProvision.apk files

Hi
I'm using samsung s4 at&t version and I was have problem with wifi and tethering

So I decided to make it root and install a new skript

Which contain following procedure
To rename TetheringProvision.apk and TetheringProvision.oden file
To TetheringProvision.abk and TetheringProvision.abk2 but mistakenly I give them the same name

And TetheringProvision.abk2 file disappeared

Now I am worry to do next step

Which is to download new apk file and paste it to
System/app

Should I do it or nor
Orr howww can I restore my apk files back to my origional ones???

Please help me as soon as possiable