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.
you can do that in Kies, by updating to factory version from the update menu
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