Is it possible to re-install the OS (Android 2.3.6) on to my GT-S5830i?
If yes, how can I get that done?
Yes.you can reinstall the OS.
There's a low level flash tool called heimdall (or Odin) that can be used to reinstall the firmware or install aftermarket firmware onto the Galaxy Ace.
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you can do that in Kies, by updating to factory version from the update menu
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