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Help How to make system custom to official(Galaxy S duos 7582)

I assume the device is otherwise stock i.e. the official Samsung firmware and recovery are installed, and the binary counter has been reset?

Try this:
Go to Settings/About device/Software updates and select "Check updates". Once a response has been received, reboot the phone and System Status should now show "Official"
 
Screenshot_2015-08-11-16-57-49.png
 
So that tells me (and you) that the installed firmware is not the stock official Samsung one. You need to

1. Reset the Binary Counter (if present) using Triangle Away
2. Flash the stock recovery
3. Wipe/factory-reset the device
4. Flash the stock ROM
 
You get that from flashing anything with odin, whether it is cf auto root or a custom recovery. Also from using one tap root methods and modifying /system files. If you want to go back to official status (btw why do you want to have official status?) you'd have to flash stock firmware with odin like slug said.
 
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